If the dimensions of length are expressed as ${G}^{x}{c}^{y}{h}^{z}$; where G, c and h are the universal gravitational constant, speed of light and Planck's constant respectively, then

(1) $x=\frac{1}{2},\text{\hspace{0.17em}\hspace{0.17em}}y=\frac{1}{2}$

(2) $x=\frac{1}{2},\text{\hspace{0.17em}\hspace{0.17em}}z=\frac{1}{2}$

(3) $y=\frac{1}{2},\text{\hspace{0.17em}\hspace{0.17em}}z=\frac{3}{2}$

(4) $y=-\frac{3}{2},\text{\hspace{0.17em}\hspace{0.17em}}z=\frac{1}{2}$