In the Thomson's model of atom,which of the following statements are correct ?

1) the mass of the atom is assumed to be uniformly distributed over the atom

2) the (+) ve charge is assumed to be uniformly distributed over the atom

3) the e^-s are uniformly distributed in the positively charged sphere

4) the e^- s attract each other to stabilize the atom.

a) 1, 2 and 3 b) 1 and 3 c) 1 and 4 d) 1, 3 and 4