The Measurement Is $8 \frac { 6 } { 7 }$

Multiple Choice

The measurement is $8 \frac { 6 } { 7 }$ in. Find the precision and the greatest possible error of the measurement.

A) $\frac { 1 } { 7 }$ in., $\frac { 1 } { 14 }$ in.
B) $\frac { 1 } { 14 }$ in., $\frac { 1 } { 7 }$ in.
C) $\frac { 1 } { 7 }$ in., $\frac { 1 } { 7 }$ in.
D) $\frac { 1 } { 7 }$ in., $\frac { 1 } { 21 }$ in.
E) $\frac { 1 } { 14 }$ in., $\frac { 1 } { 14 }$ in.