$\begin {array} {1 1} (1)\;the\: stopping\: potential \: will\: be\: 0.2 \: V & \quad (2)\;the \: stopping \: potential \: will \: be\: 0.6\: V \\ (3)\;the \: saturation\: current\: will \: be\: 2 \: mA & \quad (4)\;the\: saturation\: current \: will\: be\: 6 \: mA \end {array}$

$\begin {array} {1 1} (a)\;1 \: and \: 3 & \quad (b)\;2 \: and \: 3 \\ (c)\;1\: and \: 4 & \quad (d)\;2\: and \: 4 \end {array}$