मानसिक समायोजन की एक रणनीति के रूप में रक्षा तंत्र (Defense mechanisms) का उपयोग करने की अवधारणा मूल रूप से किसके द्वारा पेश की गई थी?

A teacher notices that a student who feels frustrated about their poor performance often accuses classmates of not working hard enough. Which defense mechanism is the student demonstrating?

Which of the following is an example of the defense mechanism called 'denial'?