单选题 An analyst does research about future market transactions. The following information relates to futures market transactions for both an investor with a long position and an investor with a short position in the market:

Initial futures price per contract on Day 0	$100
Initial margin requirement per contract	$6
Maintenance margin requirement per contract	$4
Number of contracts held by each investor	10
Settlement price per contract on Day 1	$103

At initiation of the contracts, each investor deposited enough funds to just meet the initial margin requirements. Which of the following statements about the two investors is most accurate? The amount of funds that must be deposited on Day 2 by the investor holding the:
A. short position is $10.
B. long position is $30.
C. short position is $30.