Which of the following statements regarding self$-$insurance by a business is CORRECT?

Question $18$ options:

a$)$

The self$-$insurer must be able to competently manage the investment of the self$-$insurance fund.

b$)$

Small$-$to$-$medium$-$sized companies commonly utilize self$-$insurance to avoid the cost of traditional insurance premiums.

c$)$

Self$-$insurance funds generally should be held in the businesses' general funding account.

d$)$

The organization should have enough homogeneous exposure units to make losses unpredictable.