What is the minimum key size to enable SSH v2?

A.
512 bits

B.
768 bits

C.
1024 bits

D.
2048 bits

Explanation:
According to Cisco it is important to generate a key-pair with at least 768 as bit size when you
enable SSH v2
http://www.cisco.com/en/US/tech/tk583/tk617/technologies_tech_note09186a00800949e2.shtml