What is true of passing by value and result in the following code? More than one answer is correct. Perform calculate_sales using amount. FORM calculate_sales changing value(f_amount) a) Formal Parameter f_amount is allocated it’s own memory space b) The address of the actual parameter is passed to the formal parameter c) Formal parameter is copied to memory space of actual parameter at the end of the form d) Formal parameter is not copied to memory space of actual parameter