7. Log4j.properties is set to 'warn'. Which would show in the log file? а. Info b. Debug С. Trace d. Error Which would lock an object so that it could only be used by a single thread? 8. а. join() b. yield() С. synchronized() d. start() Which of the following is an example of a dependency between 2 objects? 9. а. Vehicle and car b. Person and employee С. Pilot and plane d. Generic database reader and Oracle database reader

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