Sheridan Inc. incurred the following costs during the year ended December 31, 2021: Laboratory research aimed at discovery of new knowledge $300000 Costs of testing prototype and design modifications 62000 Quality control during commercial production, including routine testing 264000 of products Construction of research facilities having an estimated useful life of 6 years but no alternative future use 360000 The total amount to be classified and expensed as research and development in 2021 is

a. $986000.

b. $722000.

c. $422000.

d. $686000.