C++

4 Point out whether each of the following program segments is valid or invalid. If it is invalid, explain why. Assume the following declarations: double a = 8.1, b = 2.5; const double *aPtr=&a; double * const bPtr = &b; (a) *aPtr = &b; (b) *apts = 6.5; (c) aptr = &b; (d) aptr = b; (e) *bPtr=3.4; (f) betr=&a