A large corporation has just introduced metric requirements in its human resources department. HR is now to use these metrics to perform in-depth analysis to show patterns to justify investments in key expenditures. What types of challenges does this type of "big data" bring HR?

a. Concerns about the privacy of candidate data because HR systems are frequently hacked.

b. Creates less of a paper trail for employees since frequently documents are digital.

c. Concerns about communication and productivity.

d. Increases pressure for HR to now add in metrics and in-depth analysis in addition to recruiting, hiring and managing employee resources.