Which of the following statements is correct?

$$ Option A: Endowments are unrestricted donations which can be used for any purposes that are consistent with the goals and objectives of the not$-$for$-$profit organization.

$$ Option B: Endowments are donations that are received with the provision that it will be invested and only the investment income may be spent by the organization.

$$ Option C: Endowments may be restricted and unrestricted funds which must be used in accordance with the wishes of the contributor and only available during the life of the donor.

$$ Option D: Endowments are provided as donations which only allow a not$-$for$-$profit organization to invest in other not$-$for$-$profit organizations only.