Which of these is a famous Pop Art painting by Roy Lichtenstein?

I Know...Brad (sometimes I Know How You Must Feel, Brad) is a 1964 pop art painting by Roy Lichtenstein that uses his classic Ben-Day dots and a speech balloon. The work is located at the Wallraf-Richartz Museum in Cologne. It is an example of how Lichtenstein used his artistry to make significant changes to the original comics sources. Lichtenstein stated that the name Brad sounded heroic to him.

Measuring 174 cm × 95.9 cm. (68.5 in × 37.75 in), I Know...Brad is considered an ironic depiction of emotional expression. The work is a three-quarter-length, single image of a lovelorn girl. This is one of Lichtenstein's post-1963 comics-based women that "...look hard, crisp, brittle, and uniformly modish in appearance, as if they all came out of the same pot of makeup."