$(i)$ The wavelength of microwaves is greater than that of $UV$-rays.
$(ii)$ The wavelength of $IR$ rays is less than that of $UV$-rays.
$(iii)$ The wavelength of microwaves is lesser than that of $IR$ rays.
$(iv)$ Gamma rays have the shortest wavelength in the electromagnetic spectrum.
Of the above statements:

• A
  $(i)$ and $(ii)$ are true
• B
  $(iii)$ and $(iv)$ are true
• C
  $(i)$ and $(iii)$ are true
• D
  $(i)$ and $(iv)$ are true