Sandra has just recently started working for GreenFields Inc., a small landscaping firm which operates solely in the city of Langley, British Columbia. As an employee of GreenFields, Sandra has joined the company group extended health insurance plan. The plan includes vision, dental, and prescription drug coverage. Which of the following statements CORRECTLY describes the tax implications of Sandra's group extended health insurance premiums and benefits?

a. Premiums paid by Greenfields would be considered a taxable benefit to Sandra.

b. Premiums paid by Greenfields are a tax deductible expense for Greenfields.

c. Premiums paid by Sandra are tax-deductible for Sandra.

d. Prescription drug benefits received by Sandra are taxable.