In the structure of the Svetambara Jain canon, what is the specific relationship between the 'Angas' and the 'Upangas'?

Options:

• A: The Upangas are independent philosophical treatises written by Digambara acharyas to refute the Angas.
• B: Each of the twelve Upangas serves as a systematic supplement or appendix corresponding directly to one of the twelve Angas.
• C: The Upangas are secret esoteric texts meant only for senior monks, while the Angas are for lay followers.
• D: The Upangas were compiled at Pataliputra, whereas the Angas were compiled much later at Vallabhi.

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