In each case, determine whether W is a subspace of R2. If W is a subspace, then give a geometric description of W. W={x:x1=2x2}.
A) W is a subspace and represents a line passing through the origin at a 45-degree angle.
B) W is not a subspace of R2.
C) W is a subspace and represents all points along the x-axis.
D) W is a subspace and represents a vertical line passing through the origin.
