Cortina Company accumulates the following adjustment data at December $31.$

Indicate $(1)$ the type of adjustment $($prepaid expense, accrued revenue, and so on$)$ and $(2)$ the status of the accounts before adjustment $($for example, "assets understated and revenues understated"$).($Enter your answers in alphabetical order.$)$

$(2)$

Item

$(1)$

Type of Adjustment

a$.$ Supplies of $$400$ are on hand. Supplies account shows $$1,600$ balance.

b$.$ Services performed but unbilled total $$700.$

c$.$ Interest of $$300$ has been incurred and unpaid on a note payable.

d$.$ Rent collected in advance totaling $$1,100$ has been earned.

Accounts Before Adjustment