Statements A, B and D capture the core philosophy and practice of OER, whereas statement C contradicts the idea of openness. OER are typically shared under licences that explicitly permit retention, reuse, revision, remixing and redistribution. They may be developed by individuals, institutions or networks of educators. Since C says adaptation must always be prohibited, it conflicts with widely used open licences and must be excluded from the correct set.
Option A:
Option A is incomplete because it includes only A and B and leaves out D. While openness of licences and five-R permissions are essential, recognising that various actors, from single teachers to large consortia, can create OER is also important. Therefore, this option does not contain all the correct statements.
Option B:
Option B is incomplete because it selects A and D but omits B. Without mentioning the five-R activities in B, the description of what OER licences allow remains vague and does not fully explain their distinctive flexibility. Hence, this combination is not fully correct.
Option C:
Option C is correct because it brings together statements A, B and D, which together explain what OER are, what their licences typically permit and who can produce them. By excluding C, it rejects the idea that adaptation must be forbidden, which is opposite to the spirit of openness.
Option D:
Option D is incorrect because it includes only B and D and omits A. Although B and D are true, A provides the fundamental definition of OER as freely available, openly licensed materials, so its absence makes the combination incomplete.
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