Meredith bought $2$ tickets for a concert. Afterwards, she got her work schedule and discovered that she was scheduled to work the night of the concert. Meredith decided she would sell the tickets. She posted on Facebook, "For sale$--2$ front row seats to see Jo's Addiction next Friday, only $$70!"$ Her co$-$worker, Christina, responded to the Facebook post, "I'll take them for $$60!"$ Meredith replied, "Great! I'll have them for you at work tomorrow." Which of the following is true?

Question $9$ options:

There is no agreement because the money has not yet been paid.

There is no contract because you can't make a contract over Facebook.

Christina made a counteroffer.

Meredith can still revoke her offer.