Both form 16a and form 16

Hi ,

I have beem working in a privte software company since december 2013,

I have received form 16a for quater 3 and 4 and even recieved form 16 for the period of march to june,

as I have joined the company as apprentice they have provided form 16a and in march i have converted to associate and recieved a salary,so they provided form 16.

My question is while filing e returns, which form do i need to file itr1 or itr4s or /both ? 

Please answer my question...