4. (5 pts) Assume that a, b, c, and d are defined as follows, and calculate the results of the following operations. It is good to leave a space before and after the () operator. --{-} ] 5-6 ;] -- (a) result = a . c; (b) result = a * [cc]; (c) result = a . [cc]; (d) result = a + b; (e) result = a *b