Which statement is correct regarding mortgage interest deductions for $2025?$

Home equity loan interest incurred prior to TCJA enactment remains fully deductible.

Home mortgage acquisition interest is currently limited to the interest on $$1,000,000$ of debt incurred.

A refinanced $$750,000$ mortgage from $2010$ may be refinanced in $2025$ for its full current amount, and all the interest expense is deductible.

If an existing mortgage is refinanced with an additional amount of $$100,000$ for personal purposes, the taxpayer may deduct the additional interest expense for the $$100,000.$