Which of the Following Statements Is True

Which of the following statements is true?

A) Marking to market refers to the process by which the prices on outstanding futures contracts are adjusted each hour to reflect current futures market conditions.
B) Marking to market refers to the process by which the prices on outstanding futures contracts are adjusted each day to reflect current futures market conditions.
C) Marking to market refers to the process by which the prices on outstanding futures contracts are adjusted each week to reflect current futures market conditions.
D) A Marking to market refers to the process by which the prices on outstanding futures contracts are adjusted each month to reflect current futures market conditions.