Which of the following is the proper accounting treatment for purchased goodwill? a. Purchased goodwill must be capitalized and amortized over 70 years or less. b. Purchased goodwill must be capitalized and amortized over 20 years or less. c. Purchased goodwill must be expensed. d. Purchased goodwill must be capitalized and expensed each year to the extent that the value has declined