Determine the electrical current $($I$2)$ and voltage $($V$2).$ Assume that the diode comes on when a forward bias voltage of $0\mathrm{.}7$ V is applied.

a$.$ Current is $0\mathrm{.}1$ mA and voltage $1\mathrm{.}4$ V

b$.$ Current is $0$ mA and voltage $4\mathrm{.}0$ V

c$.$ Current is $0\mathrm{.}1425$ mA and voltage $5\mathrm{.}7$ V

d$.$ Current is $0\mathrm{.}1$ mA and voltage $4\mathrm{.}0$ V