The angular momenta L$($t$)$L$($t$)$L$($t$)$ of a particle in four situations are:

L$($t$)=3$timestplus$4$L$($t$)=3$ times t plus $4$L$($t$)=3$timestplus$4,$

L$($t$)=$negative$6$timestsquaredL$($t$)=$ negative $6$ times t squaredL$($t$)=$negative$6$timestsquared,

L$($t$)=2$L$($t$)=2$L$($t$)=2,$

L$($t$)=4$dividedbytL$($t$)=4$ divided by tL$($t$)=4$dividedbyt.

Match the situation to when the net torque fulfills each of the following conditions. The net torque on the particle is:

a$)$ Zero,

b$)$ Positive and constant,

c$)$ Negative and increasing in magnitude $($for t$>0$t $>0$t$>0),$

d$)$ Negative and decreasing in magnitude $($for t$>0$t $>0$t$>0).$