Unconscious process of forgetting

Repression is a psychological defense mechanism in which unpleasant thoughts or memories are pushed from the conscious mind. Repressed memory occurs when trauma is too severe to be kept in conscious memory and is removed by repression or dissociation or both. At some later time, it may be recalled, often under innocuous circumstances, and reappears in conscious memory. Key Points

• This is the basic defense mechanism that banishes consciousness anxiety-arousing thoughts, feelings, and memories.
• It is a defense mechanism whereby unpleasure-provoking mental processes, such as morally disagreeable impulses and painful memories, are actively prevented from entering conscious awareness.
• When the brain creates memories in a certain mood or state, particularly of stress or trauma, those memories become inaccessible in a normal state of consciousness.
• While the individual may have no conscious awareness of the repressed memory, that memory will still affect conscious behavior.

Hence, we can conclude that option 3 is correct, Repression is an unconscious process of forgetting.