How to increase equilibrium of Cl₂

$\ce{Heat\ +\ PCl5(g)\ \rightleftharpoons\ PCl3(g)\ +\ Cl2(g)}$

According to the process above, which of the following can be done to increase the number of moles of $\ce{Cl2}$ in a sealed container at equilibrium?

1. Reducing temp
2. Increasing the pressure at a constant temp
3. Adding more moles of $\ce{PCl5}$

I'm pretty sure it's not 1. but I'm stuck between 2. and 3. Are they both true or only one of them?

yest the answer 3. is correct. It will be even more effective to adding more $\ce{PCl5}$ and increasing temperature too.