The correct option is B rolling settlement
NSE employs a rolling settlement mechanism where each trading day is considered as a trading period. Meeting international benchmarks and standards is one of the objectives
of NSE. NSE ensures equal access for investors all over the country
with the help of appropriate communication network. The NSEI was
established by financial institutions, insurance companies and banks.
NSE is managed by professionals, who do not directly or indirectly trade
on the exchange.