Why is analysis of intangible assets more challenging than the analysis of tangible long-lived assets?

a. Except for software development costs under U.S. GAAP and development costs under IFRS, firms generally do not recognize internally developed intangibles as assets on the balance sheet.
b. U.S. GAAP and IFRS require firms to measure the fair values of identifiable intangibles acquired in a business combination and assess whether they have finite lives or indefinite lives.
c. Differences between U.S. GAAP and IFRS in the treatment of development costs mean that comparisons of firms that apply U.S. GAAP with firms that apply IFRS require consideration of and adjustment for those differences.
d. all of the above
e. none of the above

D