TIMED!!!
Which equation finds the value of x in the triangle below?

Right triangle X Y Z is shown. Side X Z has a length of 12, side Z Y has a length of x, and hypotenuse X Y has a length of z. The angle opposite to side x is 20 degrees.
Answers to choose from are:
a) cot70 = x/12
b) cot 70= 12/x
c) sec 20= x/12
d) sec20 = 12/x