Under 14 CFR § 107.51(c), the minimum flight visibility, observed from the location of the control station, must be no less than —

Why: 14 CFR § 107.51(c) requires a minimum flight visibility of no less than 3 statute miles, observed from the control station's location.

• 1 statute mile is far below the actual 3-statute-mile minimum required by § 107.51(c).
• 5 statute miles overstates the requirement; the rule sets the minimum at 3, not 5, statute miles.