Which of the following is an example of a sunk cost?

Group of answer choices

The electrical fee John will need to pay for charging his Tesla to drive to San Francisco at the end of this week.

The payment for babysitting service Trishia will need to pay to take car of her son if she wants to go on a conference next month.

The tuition fee Letitia paid for her education at San Francisco State University in the fall 2019 semester.

The price for car-cleaning service, in case Haze is too busy to wash his car himself this week but must have it clean to drive to a wedding party this coming weeked.