Suppose that x=(2,1,0,3),y=(3,−1,5,2), and z=(−1,0,2,1). Which of the following vectors are in span {x,y,z} ?
a. (−2,3,−7,3)
b. (2,3,−7,−3)
c. (12,18,−42,18)
d. (2,3,7,3)
e. None of these