Must is a different concept from Option. Option is related to Express. Express is related to Rush. 
Enforce is a type of Compel. Compel is related to Influence. Influence is a synonym of Move. Transmit is a type of Move. 
Must <--DistinctFrom--> Option <--RelatedTo--> Express <--RelatedTo--> Rush 
Enforce --IsA--> Compel <--RelatedTo--> Influence <--Synonym--> Move <--IsA-- Transmit 