A student pilot takes the pre-solo knowledge test. What must the instructor do at the end, before solo flight?

1. 1Review all incorrect answers with the student
2. 2Give a passing grade to a student who scores 70 percent
3. 3Send the test results to the FAA for review
4. 4Review only the questions about airspace

Source: 14 CFR Part 61, § 61.87 Solo requirements for student pilots.