What is the equation of the midline for the function y = 3cos(x - π ) - 4?

y = -4
y = -π
y = 4
y = π

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

Answers4.) -1/205.) -1/406.) -55/127.) -3/4