Which of the following was not a law passed by southern states in order to disenfranchise African Americans?

Which of the following was not a law passed by southern states in order to disenfranchise African Americans?
a.poll taxes
b.proof of honorable service in the Union military forces
c.grandfather clauses requiring non-slave status of ancestors
d.requirement to show property-owning and residency documentation
e.literacy tests
 
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