If a person is a member of the clearing house in the futures market, when would this person usually be required to submit more cash into the clearing house account if there is an adverse price movement?

a. there will be no such requirement because the trader cannot lose more than the amount initially committed

b. when there is a margin call

c. at the end of the trading day in accordance with daily settlement

d. at the maturity date of the contract e. at the beginning of the next day in accordance with daily settlement