Which of the Following Is Offered by Full-Service Brokerage Accounts

Which of the following is offered by full-service brokerage accounts but not self-directed brokerage accounts?

A) The opportunity to trade in stocks, bonds, and mutual funds.
B) The ability to buy uncommon investments such as REITs.
C) The option to receive investment advice from a brokerage employee.
D) Low management fees and, sometimes, no commissions on sales.