PLS HELP! Choose the student who solved the equation correctly. 12a = 6

Maria's work 12a = 6 12a/12 = 6/12 a = 2

Jessi's work 12a = 6 12a/12 = 6/12 a=1/2

Marcus's work 12a = 6 12a/6 = 6/6 a = 1

Trevor's work 12a = 6 12a/6 = 6/6 a = 2