What trading restrictions are imposed on my account for 90 calendar days after failing to satisfy an Intraday Margin Deficits (IMD)?

Under the FINRA rule change, which removes day trading margin requirements and replaces them with intraday margin standards, if an Intraday Margin Deficit (IMD) is not satisfied within five business days and the client makes a practice of failing to satisfy IMD "as promptly as possible", the account is restricted from creating or increasing a short position or debit balance (other than by closing a short position) for 90 calendar days after that fifth business day, or until the IMD has been satisfied. During this restriction period, permitted option strategies will be limited to long calls or long puts. 

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Are there de minimis Intraday Margin Deficit (IMD) amounts?
What happens if I do not satisfy an Intraday Margin Deficit (IMD)?
Are all of my accounts subject to the 90-day restriction if I hold multiple Reg T Margin accounts and fail to meet Intraday Margin Deficits requirements?
Is my account still subject to the IMD requirements if the deficit was caused by fraudulent activity?