A plant asset was purchased on January $1$ for $$35000$ with an estimated salvage value of $$7000$ at the end of its useful life. The current year's depreciation expense is $$3500$ calculated on the straight$-$line basis and the balance of the Accumulated Depreciation account at the end of the year is $$17500.$ The remaining useful life of the plant asset is

$3$ years.

$10$ years.

$8$ years.

$5$ years.