Iwill buy a drum set if and only if i save my allowance. determine the conditions that make the biconditional true. a. it is true if i buy a drum set and i save my allowance. it is true if i buy a drum set and i don’t save my allowance. b. it is true if i don't buy a drum set and i save my allowance. it is true if i don’t buy a drum set and i don't save my allowance.. c. it is true if i buy a drum set and i don’t save my allowance. it is true if i don’t buy a drum set and i don’t save my allowance. d. it is true if i buy a drum set and i save my allowance. it is true if i don’t buy a drum set and i don’t save my allowance.