Given the task definition and input, reply with output. In this task, you are given a text which is the body of a document. You are given a question and options. Pick the correct number. Don't generate anything else apart from the numbers provided in options.

Context: Alden is a lunar crater that lies on the far side of the Moon between Hilbert to the north-northwest and Milne to the south-southeast. To the south-southwest lies Scaliger.Alden has a low rim that is overlain in the north and northeast by Alden C and the smaller Alden E. The rim is worn and eroded especially along the southern wall. The floor is somewhat irregular and pitted. The small crater Alden V lies just inside the north rim and is attached to Alden C to the east.
Question: The document can be classified to which topic?
Options: 1)Album, 2)NaturalPlace, 3)EducationalInstitution, 4)OfficeHolder
2