Deposit insurance provides protection to depositors in case their bank fails, which reduces the risk for depositors. However, it also creates a moral hazard problem for banks, as they are incentivized to take on riskier investments since the cost of default is borne by the insurance fund, not the bank itself.

A is incorrect because depositors are not the ones who are taking on the risk. Banks are the ones who are taking on the risk by making investments. Depositors are simply the ones who are entrusting their money to banks. If a bank fails, depositors may lose their money, but it is the bank that is taking on the risk of failure. Instead, insurance makes depositors less keen on monitoring the bank's finances and decisions.

C is incorrect. Deposit insurance does not incentivize regulators to reduce oversight of banks, as regulators are responsible for ensuring that banks meet certain standards of safety and soundness at all times.

D is incorrect. Deposit insurance does not incentivize bank employees to engage in fraudulent activities, as fraudulent activities can lead to regulatory sanctions, lawsuits, and other adverse consequences.