A customer's margin account has a current market value of $10,000, a debit balance of $8,000, and SMA of $1,000. The customer could meet a maintenance call with:
1) Adding $1,000 to the account
2) Withdrawing $1,000 from the account
3) Selling $1,000 worth of securities from the account
4) Purchasing $1,000 worth of securities for the account