What is the value of μ1(out-of-control mean) in the terms of the actual target mean μ0, and the shift?

• A. μ1=μ0+δσ
• B. μ1=μ0+2δσ
• C. μ1=μ0+\(\frac{δ}{2}\)σ
• D. μ1=μ0-δσ