3. Let A be the 9 x 15 coeficient matrix of a homogeneous linear system, and suppose that this system has infinitely many solution with 8 parameters.

• What is the rank of A?

• Do the columns of A, considered as vectors in R9, span R9?

A. 0, Yes

B. 7, Yes

C. 7, No

D. 6, Yes

E. 6, No

F. 9, No