Which of the following statements are true?

RDS X would act as the standby copy and we can failover to RDS X when we have infrastructure failures in Availability Zone A$.$

RDS X would act as the standby copy because it falls within the same subnet as the main RDS database.

RDS X would act as the read replica to reduce the load on the main database by pointing read$/$write queries to RDS X$.$

RDS X would act as the read replica to reduce the load on the main database by pointing read queries to RDS X$.$