A company used straight-line depreciation for an item of equipment that cost $15,000, had a salvage value of $3,000 and a six-year useful life. After depreciating the asset for four complete years, the salvage value was reduced to $1.000 but its total useful life remained the same. Determine the amount of depreciation to be charged against the equipment during each of the remaining years of its useful life:

O $2,500.

O $2,000.

O $3,000.

$7,000.

O $1,000.