The speed gained by an 'n' segment pipeline executing 'm' tasks is:

• A. \(\frac {(n + m - 1)}{mn}\)
• B. \(\frac {mn}{(n + m - 1)}\)
• C. \(\frac {n+m}{(mn - 1)}\)
• D. \(\frac {n + m}{(mn + 1)}\)