The correct answer is (d), Proposed Mehr.
Mehr is a sum of money or property that is paid by the groom to the bride’s family at the time of marriage. It is a form of dowry, and is considered to be the bride’s property. Mehr is not a loan, and the bride is not required to repay it.
Specified Mehr is the amount of Mehr that is agreed upon by the bride and groom before the marriage. Prompt Mehr is the amount of Mehr that is paid to the bride immediately after the marriage. Deferred Mehr is the amount of Mehr that is paid to the bride at a later date, usually after the birth of a child.
Proposed Mehr is not a term that is used in Islamic law. It is possible that the bride and groom may agree to a “proposed” amount of Mehr, but this is not legally binding. The only amount of Mehr that is legally binding is the amount that is specified in the marriage contract.