$1.$ Orenthal James Sampson lost a wrongful death lawsuit and was ordered to pay the plaintiff $$5$ million. As a result of the lawsuit, Mr$.$ Sampson filed for bankruptcy. Which of the following assets are exempt assets in bankruptcy from his creditors?

$1.$ A Roth IRA worth $$900,000.$

$2.$ A rollover IRA worth $$3\mathrm{.}5$ million.

$3.$ Football memorabilia worth $$1\mathrm{.}5$ million.

$4.$ A brokerage account worth $$2$ million.

a$.1$ only.

b$.2$ only.

c$.1$ and $2.$

d$.3$ and $4.$