Study tips AWS-SysOps

Which of the below mentioned statements is not true with respect to the estimated charges?

how will AWS ensure that a switch from DB to a standby replica will not affect access to the application?

which is the best possible solution?

how many instance hours will AWS charge the user?

How can the user track the calls made to CloudWatch?

what will happen?

How can the user achieve DR?

What is the general limit for each AWS account for the maximum number of EBS volumes that can be created?

Which of the below mentioned options is a valid entry for the main route table in this scenario?

How can user achieve this?