Which of the below CIDR notation mask is assigned to a VPC which holds IPv6 IP addresses?

Answer options:

A./32
B./48
C./56
D./64

Answer - C
For IPv6, the VPC is a fixed size of /56 (in CIDR notation). A VPC can have both IPv4 and IPv6 CIDR blocks associated to it.
For more information on the VPC , please refer to the below URL:
https://aws.amazon.com/vpc/faqs/