This is my answer
1-4
1. all digital information—such as ballot definitions, voter choice records, vote tallies, or voter registration lists—is subject to malicious alteration;
2. there is no technical mechanism currently available that can ensure that a computer application—such as one used to record or count votes—will produce accurate results;
testing alone cannot ensure that systems have not been compromised; 3. and
any computer system used for elections—4. such as a voting machine or e-pollbook—can be rendered inoperable.
