One mechanism used in organizing data is by using pointer. (a) Differentiate between variable and pointer. (b) Assume the following declaration and initializations shown in Figure 1: char a = 'A', b = 'B'; char *ptrl = &a; char *ptr2 = &b; char *ptr3; Figure 1: Program Segment 1 Assume further that the address of a is 6940 and the address of b is 9772. What will be printed when the statements shown in Figure 2 are executed sequentially? Support your answer with suitable memory diagram. þtr3 = &b; cout<<"*ptr3 = "<<*ptr3<