A flow or a process can be used to assign a permission set to new users. A flow can be triggered by a record change or an invocable action, while a process can launch a flow as an immediate or scheduled action

The validation rule should be AND(ISNEW(), ISBLANK(Lead.Owner:User.Id)). This rule will prevent saving a new lead record if the owner is not a user. This will ensure that campaign members have a sales owner. Option A is incorrect because it will prevent saving any lead record if the owner is blank, which is not the requirement. Option B is incorrect because it will prevent saving an existing lead record if the owner is a queue, which is not the requirement. Option D is incorrect because it will prevent saving any lead record if the owner is a queue, which is not the requirement.

The app builder should use Sum as the type of summary in the roll-up summary field. A Sum type of summary allows the app builder to calculate the total value of a numeric field from the child records related to a parent record by a master-detail relationship. The app builder can create a roll-up summary field on the Account object that sums the Amount field from the won Opportunities related to each Account. Count is not a valid type of summary, as it does not calculate the total value of a numeric field. A Count type of summary allows the app builder to count the number of child records related to a parent record by a master-detail relationship. Max is not a valid type of summary, as it does not calculate the total value of a numeric field. A Max type of summary allows the app builder to display the largest value of a numeric or date field from the child records related to a parent record by a master-detail relationship. Min is not a valid type of summary, as it does not calculate the total value of a numeric field. A Min type of summary allows the app builder to display the smallest value of a numeric or date field from the child records related to a parent record by a master-detail relationship.

The formula for creating a visual indicator flag on each case based on the case priority should use the IMAGE and CASE functions. The IMAGE function returns an image for a given URL, and the CASE function evaluates an expression and returns a value based on that expression. Option A and D use these functions correctly, while option B and C do not.

The two reasons to create an unmanaged package are to distribute open-source projects on the AppExchange and to deploy from a Developer Edition environment. An unmanaged package is a collection of components that can be installed in any Salesforce org but cannot be upgraded or controlled by the developer. An unmanaged package can be used to share open-source projects or to deploy components from a Developer Edition environment to another org.