What is the meaning of upper control limit and lower control limit in control charts

A) Specification limits.
B) Acceptable range of the variance of a process.
C) Acceptable range of the variance of a product.
D) Customer requirements.

Water is vital _____every living thing ______, without which the world would be a dead place.   [ ]

A. to keeping; alive    

B. to keep; living    

C. to keeping; lively  

D. to keep; alive