During early $2025,$ Bob, an individual taxpayer, purchased a principal residence, taking out a mortgage of $$600,000.$ In late $2025,$ he utilizes a home equity loan to borrow $$100,000$ to pay off credit card balances and an automobile note. Which of these is CORRECT with respect to the deductibility of the interest on the home equity loan?

A$)$

All of the interest is deductible, as the total mortgage debt is under $$750,000.$

B$)$

All of the interest is deductible because the home equity loan is $$100,000$ or less.

C$)$

None of the interest is deductible because it is not considered acquisition debt.

D$)$

None of the interest is deductible because the interest on a home equity loan is never deductible.