error: % Invalid input detected at '^' marker. Above error is received when generating RSA keys for SSH access on a rout

[answerhappygod]

error: % Invalid input detected at '^' marker.
Above error is received when generating RSA keys for SSH access on a router using the crypto key generate rsa command. What are the reasons for this error?
(Choose two.)

A. The hostname must be configured before generating RSA keys.
B. The image that is used on the router does not support the crypto key generate rsa command.
C. The command has been used with incorrect syntax.
D. The crypto key generate rsa command is used to configure SSHv2, which is not supported on Cisco IOS devices.