Experienced students may serve as mentors if they are at least age $21$ and have at least $3$ years of post$-$secondary education. In cell L$2,$ enter a formula using the IF and AND functions and structured references as follows to determine if Kay Colbert is eligible to serve as a mentor:

a$.$ The IF function should determine if the value in the Age column is greater than or equal to $21$ AND the value in the student's Post$-$Secondary Years column is greater than or equal to $3,$ and should return the text Yes if a student meets both of those criteria or the text No if a student meets none or only one of those criteria.

b$.$ Fill the formula into the range $L3$:$L31,$ if necessary.