The Marathon used to be easy. But the editors are interpreting the rules in various ways. If you cannot see the cashier from the forecourt, mark the windows as obstructed. If the outside door does not have a professional sign stating no public restrooms, but the inside restroom door does, there is no selection for this and you will lose a point in grading. Treat it as a white glove audit.
Do not read so much, look about you and think of what you see there.
Richard Feynman-- letter to Ashok Arora, 4 January 1967, published in Perfectly Reasonable Deviations from the Beaten Track (2005) p. 230