Qualified Retirement Plans $($LO $9\mathrm{.}8)$

Greta and her employer have both been making contributions to a qualified retirement plan for the last $25$ years. Greta is looking forward to her retirement in a few more years and is extremely pleased to have a balance in her retirement account of $$480,000$ at the start of $2024.$ During $2024,$ the account earned interest, dividends, and capital gains and is now worth $$500,000.$ Greta takes no distributions from the plan in $2024.$ What is the treatment of the $$20,000$ increase in Greta$$s retirement account?

a$.$ Only the unrealized capital gains and losses are taxable $($if a net increase$)$ in $2024.$ The other forms of income are not taxable in $2024.$

b$.$ The interest, dividends, and realized capital gains $($but not losses$)$ are taxable in $2024.$

c$.$ The interest and dividends are taxable in $2024$ but the capital gains, both realized and unrealized, are not taxable in $2024.$

d$.$ None of the increase is taxable in $2024.$