24. let r be the set of all real number and r = {,, xg ):x, e r,x e r}.nen, which one the following is a subspace of r over r? (a) {(x, x) :x>0, x, > 0f (b) {(x

24. Let R be the set of all real number and R = {,, Xg ):X, E R,X E R}.nen, which one the following is a subspace of R over R? (a) {(x, X) :X>0, X, > 0f (b) {(X, X,) :X, E R,X, > 0} (c) (x, Xx} :X<0, X, <0} d) {(X,0) :X,E R} 25. If W, ={ (0, X2,Xg,Xg,Xg) :X2, Xg, Xa,Xs E R} and f