The inspector Royal Tank Corps Major General P,C.S Hobart detailed the two plans.
1) a inconspicuous Tank moderately well armoured and equipped with a machine gun. in mass numbers to swamp the enemy.
2) a larger type Tank mounting a cannon and armour to with stand field artillery fire
the final decision rested with master-General of the Ordnance General Sir Hugh Elles the Tank corps Commanded in France during WW1. he favoured the Infantry tanks but he was limited by peace time funds and had to opt for the smaller tank.