Which statement is correct about the Erlang-C sizing calculation model?

A.
Erlang-C assumes that calls that do not find an available agent will be blocked or dropped.

B.
Erlang-C plans for a percentage of calls to be blocked or dropped in the calculation.

C.
Erlang-C is used for sizing IVR, PSTN trunk, and queue ports.

D.
Erlang-C is used for sizing agents in a queuing model.

Explanation: