Which of the following is a true statement?
A. A person licensed as an associate broker with one firm may also be the qualifying broker with one or more other firms as long as he notifies his broker in writing.
B. A person licensed as an associate broker with one firm cannot be the qualifying broker with any other firm.
C. A person licensed as an associate broker with one firm can only be the qualifying broker with one other firm.
D. A person licensed as an associate broker with one firm can be the qualifying broker with any number of other firms without notifying his broker.