Explanation:

- Subscription from Members: Not-for-profit organizations often charge membership fees to individuals who wish to join and support their cause. This serves as a crucial revenue stream.

- Donation: Donations from individuals, corporations, or other entities are fundamental for not-for-profits. They often rely heavily on contributions for funding their operations and initiatives.

- Entrance Fees: These are charges collected from events or facilities operated by the organization. While it's not always applicable to every not-for-profit, many organizations use this as an additional income source.

- Answer: All of the above: Not-for-profits typically generate income through a combination of subscriptions, donations, and entrance fees.

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