Question

When given a line, how to find vectors A and B so that v = A + tB is a parametric equation for the line?

a) A = (0,0), B = (1,0)
b) A = (1,0), B = (0,1)
c) A = (0,1), B = (1,1)
d) A = (1,1), B = (0,1)