Which of the below is a potential problem when using the Rate of Return method to evaluate project cash flows?

a$.$ The Rate of Return calculation makes the assumption that the cash flows received during the life of the project are re$-$invested

at a rate different than the project's computed Rate of Return.

b$.$ The Rate of Return calculation tends to overstate the project's MARR.

c$.$ The Rate of Return calculation tends to understate the project's MARR.

d$.$ The Rate of Return calculation makes the assumption that the cash flows received during the life of the project are re$-$invested

at the project's computed Rate of Return.