An analyst produces the following joint probability function for fund A and fund B RA$=14\%$ RA$=8\%$ RA$=4\%$ RB $=17\%0\mathrm{.}3$ RB$=9\%0\mathrm{.}5$ RB$=2\%0\mathrm{.}2$ a$.$ Calculate the covariance between returns on fund A and the returns on fund B b$.$ Based on coefficient of variation, choose the less risky one between $$ Portfolio C consisting of $40$ percent in A and the rest in B and $$ Portfolio D consisting of $60$ percent in A and the rest in B$.$