In Vlocity Context Rules, what is a context dimension?

In Vlocity Context Rules, what is a context dimension?

Note: This questiondisplayed answer options in random order when taking this Test.
A . A variable that stores rule condition values
B . A link to data stored in sObjects, calculated using a function, or typed in during design-time
C . The relational path from a root sObject, such as an Order, to related sObjects, such as Account
D . A multi-dimensional array of sObject data

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Answer: A