The Discretionary Powers Over a Clients' Accounts Differ Between Broker-Dealers

The discretionary powers over a clients' accounts differ between broker-dealers and investment advisers in that

A) An investment adviser can execute a discretionary transaction for a client upon receiving only verbal authority initially, followed up by written authority to be received within 10 days of the order, whereas a broker-dealer must require that written authority for the transaction is in the mail before proceeding with the transaction.
B) An investment adviser can execute a discretionary transaction for a client upon receiving only verbal authority initially, followed up by written authority to be received within 10 days of the order, whereas a broker-dealer must require that written authority for the transaction is provided before the transaction even takes place.
C) A broker-dealer can execute a discretionary transaction for a client upon receiving only verbal authority initially, followed up by written authority to be received within 10 days of the order, whereas an investment adviser must require that written authority for the transaction is in the mail before proceeding with the transaction.
D) A broker-dealer can execute a discretionary transaction for a client upon receiving only verbal authority initially, followed up by written authority to be received within 10 days of the order, whereas an investment adviser must require that written authority for the transaction is provided before the transaction even takes place.