Which sentence below uses punctuation correctly?

Carla saw it but she still wasn’t sure she believed it; the squirrel really was waterskiing!

The tow truck driver said I should have taken that warning seriously: objects in mirror are closer than they appear.

We only have one rule here at Sprinkles Ice Cream Shop, make up your mind before you get in line.

Listen up, and I’ll explain it one more time: first, you put your right foot in: then, you take your right foot out.