Your architecture team has recommended the following for the VPC`s in your AWS Account
A shared services VPC which would provide services to other VPC`s.
A hosted VPC that will be accessible to the customer.
The hosted VPC will also interact with the shared services VPC.Which of the following should also be considered as part of the design? Choose 3 answers from the options given below. Each answer is an independent design solution.

Answer options:

A.Ensure a PrivateLink is available for accessing the Shared services VPC.B.Use VPC peering between the shared services VPC and other VPC`s
C.Ensure the right security measures are in place for publicly accessing the shared services.
D.Create `transitive peering` where necessary between the VPC`s

Answer - A, B and C
One option is to create a VPC privatelink which can be used to access the services in the AWS shared VPC. The below is also mentioned from the AWS Documentation to support this
You can create your own application in your VPC and configure it as an AWS PrivateLink-powered service (referred to as an endpoint service). Other AWS principals can create a connection from their VPC to your endpoint service using an interface VPC endpoint. You are the service provider, and the AWS principals that create connections to your service are service consumers.
And the other option is to make the VPC as public. But the right security measures need to be put in place.
Option D is INCORRECT because AWS does not support transitive peering between the VPCs
Please refer to page 17 and 18 of the below link
https://docs.aws.amazon.com/vpc/latest/peering/vpc-pg.pdf
For more information on VPC and Subnet sizing , please visit the below URL
https://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/endpoint-service.html