What Technique Does Meryl Streep Use to Get into Character

What technique does Meryl Streep use to get into character?

A) She views meticulous storyboards to help her work with the camera.
B) She tries to find the similarities between herself and the character.
C) She analyzes her previous roles thoroughly.
D) She shares life stories with the director to feel more comfortable being vulnerable.
E) She improvises every scene to keep a feeling of spontaneity.