If   $\mathrm{i}={\mathrm{t}}^2 0<\mathrm{t}<\mathrm{T}$  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