What is the default mapping file provided for configuring a gateway connecting a collection layer ObjectServer to the aggregation layer in a multi-tiered IBM Tivoli Netcool/OMNIbus architecture?

A.
UNI_GATE.map

B.
C_TO_A_GATE.map

C.
MULTI_TIER_GATE.map

D.
COL_TO_AGG_GATE.map