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Option b. Such craters have a downhill end is the key. There are many examples of tilted craters such as Posidonius and Gassendi, all near the edges of impact basins. But all craters have equal rim heights when first formed (other than some formed by really shallow impact angles). I don't have a good shot of Gassendi, but the image of Mare Humorum shows Gassendi's tilted rim. In this shot, I was aiming to get the graben and wrinkle ridges on Humorum. It's these features that are key in understanding the evolution of craters like Gassendi and Fracastorius.
Disclaimer: I'm really impatient and superficial when it comes to image processing. There are far cleverer people out there than me who produce the most extraordinary lunar images. I tend to cut the process short and just start trying to understand the features themselves.
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