Which description is correct when you have generated RSA keys on your Cisco router to prepare for secure device management?

You are a network technician at Cisco.com. Which description is correct when you have generated RSA keys on your Cisco router to prepare for secure device management?

A.
All vty ports are automatically enabled for SSH to provide secure management.

B.
The SSH protocol is automatically enabled.

C.
You must then zeroize the keys to reset secure shell before configuring other parameters.

D.
You must then specify the general-purpose key size used for authentication with the crypto key generate rsa general-keys modulus command.

Explanation/Reference:
The steps to enable SSH on a router are:

1) Configure a domain name on a router using the " ip domain-name name " command
2) Use the "crypto key generate rsa general-keys modulus size " command, where cisco recommends the size to be at least 1024 bits.
3) Configure SSH… like authentication-retries, and "transport input" on the vty lines to permit ssh when telnetting into the router.