Explanation:

- Mahr as a debt: Mahr is a mandatory payment in the form of money or possessions paid by the groom to the bride at the time of marriage, in Islamic law.

- Option 1: Over other creditors: This suggests that the mahr has priority over other debts or claims by creditors.

- Option 2: Over the other heir’s claim: This implies mahr takes precedence over the shares of other heirs in an inheritance situation.

- Option 3: Both (a) and (b): This option means mahr has priority over both creditors and other heirs' claims.

- Option 4: Neither (a) nor (b): This option indicates that mahr doesn't hold priority over creditors or heirs' claims.