A process that performs at a 6 sigma level: a. is considered statistically 'perfect' b. has 3.4 defects per million opportunities c. operates at a 99.99966% accuracy d. all of the above e. some of the above

d. all of the above

Explanation:

Six sigma as a 99.9997% rate of perfections which amounts to 3.4 error per million transaction.

Six sigma is an effective methodology that helps to reduce cost and decrease cycle time.

It is a methodology that increases productivity and efficiency in process, it also reduces the amount of defects and helps to eliminate it.