Announcing the maintenance window ahead of time, defining a rollback strategy, and temporarily suspending configuration changes in production are all best practices for production deployment. These practices help to minimize the risk of errors, downtime, and conflicts during the deployment process.

The architect should recommend that UC start a citizen development program to minimize additional costs and allow UC to accomplish more from the backlog. A citizen development program is a way of empowering non-technical users to create and deploy simple applications using low-code or no-code tools, such as Salesforce Platform. This can help UC leverage the skills and knowledge of their existing workforce, reduce the workload of the development team, and deliver value faster to the business.

Storing the records in sandboxes and production is not a good practice, as it can lead to data inconsistencies and conflicts. Storing the records in a version control system is a better option, as it allows tracking changes and deploying them to different environments. Using a third-party product to manage these records is also a valid option, as it can provide features such as data backup, restore, and migration.

The maximum size of deployed .zip file is 39MB for Metadata API. You can deploy up to 10,000 files, but retrieve more than 10,000 files using Metadata API.

The first step in establishing a governance framework is to identify the relevant stakeholders from within the organization to obtain their goals and objectives. This will help to define the scope, roles, responsibilities, and processes for managing the Salesforce initiatives. The other options are possible steps to take later, but not the first one.