How can integer overflow attacks and buffer overflow attacks work together?

a. An integer overflow could utilize a buffer to change the value from a positive to a negative by wrapping a large positive value around in a bank transfer

b. An integer overflow is imported during the buffer length calculation which could result in a buffer overflow attack

c. A buffer overflow attack relies on an integer overflow to change the return address in the memory of the system to the address of the attacker

d. An integer could reverse the number of units sold when accumulating a total cost of a transaction, allowing a buffer overflow to manipulate the direction of cash flow