True or false:

a. When a process is in a state of statistical control, then most of the output will meet specifications.

b. When a process is out of control, an unacceptably large proportion of the output will not meet specifications.

c. When a process is in a state of statistical control, all the variation in the process is due to causes that are inherent in the process itself.

d. When a process is out of control, some of the variation in the process is due to causes that are outside of the process.