Figure 1 represents 3 security contexts all sharing a common VLAN (500)-a single IP subnet corresponds to that VLAN.This is equivalent to connecting three security appliances using an Ethernet switch.A property of the FWSM makes all interfaces across the entire module use only one global MAC address (‘M’ in Figure 1).This is usually not a problem, until multiple contexts start sharing an interface.Which operational function within the FWSM handles this issue?

A.
Session Manager

B.
Classifier

C.
Packetizer

D.
Normalizer