Find the focus and directrix of the parabola y= 1/2 (x+2)²

a) The focus is at (-2, -2) and the directrix is at y=−4.
b) The focus is at (-2, -1) and the directrix is at y=−2.
c) The focus is at (-2, -3) and the directrix is at y=−5.
d) The focus is at (-2, -2) and the directrix is at y=−3.