A is not correct as Cloud VPN between projects does not provide you the functionality to share a subnet to host resources on.
B is not correct because peering two VPCs does allow traffic between the two shared networks, but it's only bi-directional. Peered VPC networks remain administratively separate.
C is not correct because private Google access allows you to access APIs from a private IP, but it does not have any impact on creating Compute instances on a specific subnet.
D is correct because s Shared VPC allows you to share a VPC into multiple projects, keep administrative oversight in the host project, while restricting the other projects to only create VMs on IPs in the shared VPC.
https://cloud.google.com/vpc/docs/shared-vpc
https://cloud.google.com/vpc/docs/vpc-peering

https://cloud.google.com/iap/docs/concepts-overview
"Use IAP when you want to enforce access control policies for applications and resources."

A is correct because deployment policies defined in Binary Authorization ensure that only trusted images can be deployed in Google Kubernetes Engine clusters. Binary Authorization can integrate with Container Analysis which scans container images stored in Container Registry for vulnerabilities and stores trusted metadata used in the authorization process.
B is not correct because it doesn't address the use case.
C is correct because vulnerability scanning can be performed by Container Analysis to discover package vulnerability information in container base images and obtain CVE data from respective Linux distributions.
D is not correct because it doesn't address the use case.
https://cloud.google.com/binary-authorization/docs/overview
https://cloud.google.com/container-registry/docs/container-analysis

Create a lifecycle policy JSON:
Specify an action (SetStorageClass) to move objects to COLDLINE storage.
Include a condition (age) to apply the policy to objects older than 365 days.
Use the matchStorageClass parameter to apply the policy only to objects currently in STANDARD storage, ensuring that objects already in lower-cost classes (e.g., COLDLINE or ARCHIVE) are not unnecessarily moved.