Mark Baltz is a former official in the National Football League (NFL) from 1989 through 2013. He has worked as a head linesman throughout his entire career in the NFL and has been assigned to 21 post-season games, including five conference championship games (1998, 1999, 2000, 2001, 2004). He wore uniform number 26.

Can we draw the following conclusion?
Mark Baltz belongs to the National Football League.

Choose from:
A). Yes.
B). It's impossible to say.
C). No.
A).