Underline$/$circle the correct choices for a$)-$d$)$: When throttling a gas is below its upper inversion temperature and above its lower inversion temperature $($circle the correct choice$1/$choice$2)$:$$

a$)$ mJT is negative$/$positive$,$

b$)$ since $$ is always negative$/$positive$,$

c$)$ thus $$T must be negative$/$positive$,$

d$)$ causing the gas to cool$/$warm up$.$