If $\mathrm{i}={\mathrm{t}}^2,\text{ and }0 < \mathrm{t} < \mathrm{T},$ then r.m.s. value of current is

• A

  $\frac{{\mathrm{T}}^2}{\sqrt{2}}$

• B

  $\frac{{\mathrm{T}}^2}{2}$

• C

  $\frac{{\mathrm{T}}^2}{\sqrt{5}}$

• D

  None of these