Adam, a small business owner, needs an accountant to complete his tax return. He drops by a Darkness LLC$,$ a local accountant's office, explains his situation to the accountant, and learns what fees Emily charges. The next day, Adam returns and gives the receptionist all the necessary documents to complete his tax return. Adam then walks out without saying anything further to the accountant. Has Adam entered into a contract? If so$,$ what type? Please support your answer using a citation from the textbook.