In the Thomson's model of atom,which of the following statements are correct?
$(i)$ The mass of the atom is assumed to be uniformly distributed over the atom.
$(ii)$ The positive charge is assumed to be uniformly distributed over the atom.
$(iii)$ The electrons are uniformly distributed in the positively charged sphere.
$(iv)$ The electrons attract each other to stabilize the atom.

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