What is an appropriate use of Processing Rules?

What is an appropriate use of Processing Rules?
A . Divide a variable value at a delimiter and put part of it into prop43
B . Set an event every time the VISTA rule sets ‘’Bing organic in the tracking code report
C . Copy a Context Data variable value into avar10
D . Cause a VISTA rule running on eVar1 to be processed after marketing Channels

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Answer: A