Options buy and sell

F&O
1

Ex.

  1. Nifty 11500 call @50 april buy on delivery basic.
    So i pay total premium 3750. And additional required for the span and exposer margin?
2

While buying you need only cash (3750 in this case). Margin is required only for selling options

3

Same rule in bank nifty???

4

Just any Options, be it nifty, banknifty of stock options