Portfolio Margin in case of Option a/c

moka2

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In following type of trading does it matter if the a/c is Cash a/c / Reg T margin a/c or Portfolio Margin A/c ( all US market)

1) Scenario 1: Say one has 10K in a/c and is long an Option worth 10K ( call / put does not matter)
Given that to be long an option is a limited risk strategy one has to have 100% of that money upfront.
If that is true then having a portfolio margin a/c has no real advantage is it?
Please correct me if I am wrong
1) Scenario 1: Say one has 10K in a/c and is long an Option Spread worth 10K ( call / put does not matter)
Given that to be long an option spread is a limited risk strategy one has to have 100% of that money upfront.
If that is true then having a portfolio margin a/c has no real advantage is it?
Please correct me if I am wrong
 
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