Mark to Market Accounting for 1256 Contracts

What is the preferred (presumed correct) for establishing market value for options on 1256 contracts with a wide bid/ask spread?
 
Quote from dave_s:

What is the preferred (presumed correct) for establishing market value for options on 1256 contracts with a wide bid/ask spread?

The OCC generally marks options on the BID/ASK mid point.
 
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