Johnson Bookkeeping has a computer that was purchased July 1, 2019, for $1,800. Ms. Johnson thinks that the computer will be obsolete by June 30, 2021, and will have no value at that time. What is the required adjusting journal entry on December 31, 2019? O A. B. O C. O D. Dr. Accumulated Amortization, Computer Cr. Amortization Expense, Computer Dr. Amortization Expense, Computer Cr. Accumulated Amortization, Computer Dr. Accumulated Amortization, Computer Cr. Amortization Expense, Computer Dr. Amortization Expense, Computer Cr. Accumulated Amortization, Computer 450 900 900 450 450 900 900 450