The Main Issue in CASE 6

The main issue in CASE 6.3 National Association of Manufacturers v.National LaborRelationsBoard (2013) was whether the NLRB:

A) had the authority to promulgate a rule stating that the employer's failure to post a notice constituted an "unfair labor practice."
B) had Congressional intent to enact a regulatory program requiring notices to all its employees.
C) had exhausted all administrative relief before it filed suit.
D) had an obligation to follow its own rules before it became binding on the public.