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Rewrite the expression in simplest radical form:

$${ a }^{ \frac { 2 }{ 3 } }{ b }^{ \frac { 1 }{ 6 } }$$

$\sqrt [ 3 ]{ { a }^{ 2 }{ b } }$

$\sqrt [ 6 ]{ { a }^{ 2 }{ b } }$

$\sqrt [ 3 ]{ { a }^{ 4 }{ b } }$

$\sqrt [ 6 ]{ { a }^{ 4 }{ b } }$