The asset? account, Office? Supplies, had a beginning balance of $ 3 comma 400 $3,400. During the accounting? period, office supplies were? purchased, on? account, for $ 2 comma 700 $2,700. Supplies Expense for the accounting period is $ 4 comma 900 $4,900. What is the ending balance of Office? Supplies? A. $ 4 comma 900 $4,900 B. $ 1 comma 200 $1,200 C. $ 6 comma 100 $6,100 D. $ 5 comma 600 $5,600