Discussion
A definition of a variable reaches a point if
Answer: C
Correct answer: there is a path from the definition to the point with no redefinition
Reaching definitions is a forward analysis, and the definition of the property is a path property: some path exists along which the assignment is not overwritten. Note the word some - the analysis is a may analysis, so a definition reaches if it might, which is what makes the result conservative and therefore safe.
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