In the figure, a ladder of weight 200 N and length 10 meters leans against a smooth wall (no friction on wall). A firefighter of weight 600 N climbs a distance x up the ladder. The coefficient of friction between ladder and the floor is 0.5. What is the maximum value of x if the ladder is not to slip?
A) 6.28 m
B) 6.04 m
C) 8.44 m
D) 3.93 m
E) 5.00 m
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