C3. Let W = [x1, X2, 23, 24] ER4 x1 = s+ t, X2 = 2t, x3 = s -t, x4 = 4s). a. (3 marks) Show that W is a subspace of 4. b. (1 marks) Determine dim(W). c. (4 marks) Describe the orthogonal complement W- of W. d. (2 marks) Provide a basis for WI