What is the ‘span of control’ principle?

What is the ‘span of control’ principle?
A . A single person can supervise only a limited number of staff members effectively (generally up to 6)
B. A single person can supervise only a limited number of staff members effectively (generally up to 8)
C. A single person can supervise only a limited number of staff members effectively (generally up to 12)
D. A single person can supervise only a limited number of staff members effectively (generally up to 10)

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Answer: D