Jayson Walker is a member of a consumer$-$driven health plan $($CDHP$)$ that is funded by a health savings account $($HSA$)$ established by his employer, Brock Industries. Brock's CDHP also uses a high$-$deductible health plan $($HDHP$).$ The following statements are about this situation. Select the answer choice containing the correct statement.

Once the funds in Mr$.$ Walker's HSA are depleted, he cannot receive any additional medical services.

Once the funds in Mr$.$ Walker's HSA are depleted, he must pay out of pocket for medical services until the deductible required for the HDHP is satisfied.

Only Brock is permitted to deposit funds into Mr$.$ Walker's HSA.

The CDHP gives Mr$.$ Walker the freedom to choose health care providers and benefits, but Brock assumes the financial risk for all of its employees' choices under the CDHP$.$