Explanation:

- Muwajjal Mehar: This refers to prompt dower, which is payable immediately after marriage or on demand by the wife. It is not related to being decided after the marriage.

- Mehrul Misl: This is the dower that is not fixed at the time of marriage. It is determined after marriage, often based on comparable marriages, usually at the instance of the wife.

- Both are true: This option would not be correct because "Muwajjal Mehar" is not the type of dower decided after marriage.

- None: This would imply neither options fit the description, which is incorrect because "Mehrul Misl" does.