Which of the following is not produced when mixture of borax and CuSO_(4) is heated at high temperature ?

Which of the following is not produced when mixture of borax and CuSO_

1.	Which of the following is not produced when mixture of borax and CuSO_(4) is heated at high temperature ?
Answer» `CU(BO_(2))_(2)` `NaBO_(2)` `B_(2)O_(3)` `Na_(3)BO_(3)` Answer :D