Which statement about installing the FWSM in a Catalyst 6500 switch is true?

Which statement about installing the FWSM in a Catalyst 6500 switch is true?

A.
It must be installed in slot 5.

B.
It cannot be installed in slot 1 because slot 1 is reserved for the Supervisor Module.

C.
It must be installed in slot 1.

D.
It is best to avoid installing it in slots 1, 2, 3, or 4 because they are used for Supervisor and
Switch Fabric Modules.