Which of the following ports should be open on the security groups for the EC2 instance and the EFS respectively to enable Secure Shell (SSH) access between them?

Answer options:

A.Open port 22(SSH) on EC2 security group and port 2049(NFS) on EFS security group.
B.Open port 22(SSH) on EC2 security group and ports 111(NFS) & 2049(NFS) on EFS security group.
C.Open port 2049(NFS) on EC2 security group and ports 111(NFS) & 2049(NFS) on EFS security group.
D.Open port 111(NFS) on EC2 security group and ports 111(NFS) & 2049(NFS) on EFS security group.

Answer: A
https://docs.aws.amazon.com/efs/latest/ug/accessing-fs-create-security-groups.html#create-security-groups-console
AWS EFS does not require any other port to be open except NFS (2049) on its security group.