Given the equation of the vertical parabola $y=0.5(x-1{)}^2+3$, determine the coordinates of the focus and the equation of the directrix.

Focus: $(1,3.5)$

Directrix: $y=2.5$

Focus: $(1,4)$

Directrix: $y=2.5$

Focus: $(1.5,3)$

Directrix: $x=0.5$

Focus: $(1,3.5)$

Directrix: $y=3.5$