What does “counting to infinity” mean in a Distance Vector protocol environment?

What does “counting to infinity” mean in a Distance Vector protocol environment?

A.
“counting to infinity” means calculating the time taken for a protocol to converge.

B.
“counting to infinity” means checking that the number of route entries do not exeed a set upper limit.

C.
“counting to infinity” can occur when Split Horizon is not enabled.

D.
“counting to infinity” means setting an upper limit for hop count, to break down routing loops if this limit is reached.