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The option Type of submission allows us to select how we want the students to submit the assignment: Online text (because the students write the answer to the assignment directly in the Virtual Classroom) or Sent files (because the students submit the assignment in pdf, Word... format, so it is the most convenient because they prepare the activity and only use the Virtual Classroom assignment to submit it). For the latter option, we can set the maximum number of uploaded files (probably only 1), the maximum size of the submission (in Mb) and even the type of files accepted (i.e. if we only want to accept pdfs, we will have to write .pdf).
