Which of the following is similar to the process of competitive inhibition?

When you arrive at work in the morning, you are unable to park your car in your assigned parking spot because the car of the person who parks next to you has taken up just enough space that you cannot fit your own car in.

When you arrive at work in the morning, you are unable to park your car in your parking spot because someone with a car exactly like yours has already taken your spot, leaving you nowhere to park your car.

As you are about to park your car in your spot at work, a giant bulldozer comes along and smashes your car away from the spot, preventing you from parking your car in your spot.

When you arrive at work in the morning, you are unable to park your car in your parking spot because someone has placed a giant cement block in front of your spot.