The speed of a wave produced in water is given by $v=\lambda^a g^b \rho^c$. Where $\lambda$, g and $\rho$ are wavelength of wave, acceleration due to gravity and density of water respectively. The values of $a , b$ and $c$ respectively, are
$\frac{1}{2}, \frac{1}{2}, 0$
$1,1,0$
$1,-1,0$
$\frac{1}{2}, 0, \frac{1}{2}$
If $R , X _{ L }$. and $X _{ C }$ represent resistance, inductive reactance and capacitive reactance. Then which of the following is dimensionless: