Of the following, which is not a weakness of symmetric cryptography?

A.
Limited security

B.
Key distribution

C.
Speed

D.
Scalability

Explanation:
Symmetric cryptography is generally fast and hard to break, depending
on key size. Its weaknesses are key distribution that requires a secure mechanism to
deliver the key properly, scalability (each pair of users needs a unique pair of
keys) and limited security, which can only provide confidentiality.