Which of the following statements is not true of days' cash on hand?

a$.$ It is used by start$-$up companies to measure how long cash is available to support operations until revenues begin to be earned.

b$.$ It is a popular measure used by nonprofits to reveal how long the nonprofit could survive if contributions dropped significantly.

c$.$ Nonprofits do not have enough information to calculate this ratio.

d$.$ It can be used to estimate how long a business could survive a catastrophic event.