Find the Limit Of $s ( n ) \text { as } n \rightarrow \infty$

Multiple Choice

Find the limit of $s ( n ) \text { as } n \rightarrow \infty$ $s ( n ) = \frac { 5 } { n ^ { 3 } } \left( \frac { n ^ { 3 } ( n + 1 ) ^ { 2 } } { 7 } \right]$

A) $5 / 7$
B) 5
C) $1 / 7$
D) $10 / 7$
E) unbounded