Which of the following is most likely to raise suspicions of money laundering?

a.A bank customer regularly walks into a bank branch and deposits money every nigh just before the bank closes

B.A long time customer with a brokerage account worth $50,000 writes a check every month for $1,500 to an insurance company

c. One of the registered representatives of a broker-dealer advises a customer to buy 1000 shares of IBM stock. The next day, the customer buys2000 shares of IBM stock

d. A person opens a brokerage account on April 13. The account is funded by 15 separate wires of $1,000 each,most of them coming from locations known to be centers of the illicit drug trade. On April 18th, the customer closes the account and directs the money be wired to a Swiss bank account