What’s the RECOMMENDED twisted pair cable slack length to be left at the work area outlet location to enable the possibility of future changes in the Horizontal Cabling System?

What’s the RECOMMENDED twisted pair cable slack length to be left at the work area outlet location to enable the possibility of future changes in the Horizontal Cabling System?
A . =0.152 m (0.5 ft)
B . =0.3 m (1 ft)
C . =1 m (3 ft)
D . = 5m (16 40 ft)

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Answer: B