Comment on Online pledging of stocks for trading F&O

Sir,

I have few questions, it would be of great help if you clarify on the same.

1) What’s the difference between Span and Exposure Margin ?
2) Do I have to maintain extra cash in my account for daily MTM for futures and options ? For example for selling a Nifty 9000 CE , it requires a margin of 60,000 Rs and I have exact 60,000 in my account. I have sold the option at 115 Rs premium but at end of day premium has gone up-to 150 Rs, so should I have to keep extra cash in my account for this MTM loss, and extra is not present will my position be auto squared off ?
3) Can I withdraw the premium collected by shorting options ?

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