In a condominium association, approval to use reserves for purposes other than originally intended requires:

a$.$ Approval of $67\%$ of the unit owners.

b$.$ Board of directors approval.

c$.$ Approval of $\frac{1}{2}$ of the voting interests in the project.

d$.$ Approval of the majority of those present at a duly called meeting of the association at which a quorum is present.