Find the Right Part of the Equality $1 ^ { 2 } + 2 ^ { 2 } + 3 ^ { 2 } + \ldots + n ^ { 2 } =$

Multiple Choice

Find the right part of the equality. $1 ^ { 2 } + 2 ^ { 2 } + 3 ^ { 2 } + \ldots + n ^ { 2 } =$ ________

A) $\frac { n ( n + 1 ) ( 2 n + 1 ) } { 6 }$
B) $\frac { n ( n + 1 ) ( n + 3 ) } { 4 }$
C) $\frac { n ( n + 1 ) } { 2 }$
D) $\frac { ( n + 1 ) ( n + 2 ) } { 3 }$
E) none of the above