Which of the following is complementary angle? <br> (1) 70, 30 <br> (2) 40, 30 <br> (3) 90, 20<br> (4) 60, 70

Question

$\begin{array}{11} (a)\; 1 \\ (b)\; 4 \\ (c)\; 3 \\ (d)\; 2 \end{array}$