Which of the following is true with respect to a commercial umbrella liability policy? Select one: a. Premiums are generally tax deductible as a business expense. b. Premiums are tax deductible as a business expense for a corporation, but not for a sole proprietor. c. Premiums are not tax deductible as a business expense. d. Premiums may or may not be tax deductible as a business expense depending on the exposures covered.