Let A be of order 2×5 and B be of order 5×3. Which one of the following statements is correct?
a) Only BA is defined and its order is 3×5.},{
b) Neither AB nor BA is defined.
c) Only AB is defined and its order is 2×3.
d) Both AB and BA are defined; AB is 2×5 and BA is 5×3.}],