Which of the following statements is correct concerning significant deficiencies noted in an audit?

a. Significant deficiencies are material weaknesses in the design or operation of specific internal control components.

b. The auditor is obligated to search for significant deficiencies that could adversely affect the entity’s ability to record and report financial data.

c. Significant deficiencies need not be recommunicated each year if management has acknowledged its understanding of such deficiencies.

d. The auditor should separately communicate those significant deficiencies considered to be material weaknesses.