Before applying for a broker license, a $19-$year$-$old salesperson with $6$ months' experience must

A$.$ wait until he is $21$ years old to attend a $24-$hour broker practice course.

B$.$ obtain a certificate from his managing broker attesting to the $6$ months' experience and take the broker examination.

C$.$ obtain an additional $18$ months' experience, complete the $48-$hour broker pre$-$examination course, and pass the broker examination.

D$.$ complete an accredited $60-$hour broker pre$-$examination course and pass the broker examination.