In the picture$/$plan to the left, what does the c $=1/2"$ stand for on the W$12$x$14$ beam?

In the picture$/$plan to the left, what does the c $=1/2"$ stand for on the W$12$x$14$ beam?

beam is a composite beam

beam is off center $1/2"$

beam is composite and should be cambered $1/2"$

beam is composite and should be raised higher $1/2"$