Which two statements are true about penetration tests and vulnerability assessments? a. A penetration test is an intrusive test that attempts to exploit vulnerabilities. b. A vulnerability assessment is a nonintrusive test that attempts to exploit vulnerabilities. c. A penetration test is a passive test that attempts to discover vulnerabilities. d. A vulnerability assessment is a passive test that attempts to discover vulnerabilities. e. No permission is required before conducting a vulnerability assessment and penetration test.