Consider the Boolean function $F(w,x,y,z) = wy + xy + \overline{w}\:xyz + \overline{w}\:\overline{x}\:y + xz + \overline{x}\:\overline{y}\:\overline{z}.$ Which one of the following is the complete set of essential prime implicants?
- $w,y,xz,\overline{x}\:\overline{z}$
- $w,y,xz$
- $y, \overline{x}\:\overline{y}\:\overline{z}$
- $y,xz,\overline{x}\:\overline{z}$