A. In ad hoc mode， the Independent Basic Service Set （IBSS） is a framework in which mobile  clients connect directly without an intermediate access point.
B. In Infrastructure mode， the Basic Service Set （BSS） is a framework in which mobile clients use  a single access point for connecting to each other or to wired network resources.
C. In Infrastructure mode， the Extended Services Set （ESS） is a framework in which two or more  Basic Service Sets are connected by a common distribution system （DS）.
D. In Infrastructure mode， the Independent Basic Service Setet （IBSS） is a framework in which  mobile clients connect directly without an intermediate access point.
E. In ad hoc mode， the Basic Service Set （BSS） is a framework in which mobile clients use a  single AP for connecting to each other or to wired network resources.
F. In ad hoc mode， the Extended Services Set （ESS） is a framework in which two or more Basic  Service Sets are connected by a common distribution system （DS）