In Solow's Model of Economic Growth, Suppose That S Represents $$f ( k )$$

In Solow's model of economic growth, suppose that s represents the savings rate, z represents total factor productivity, k represents the level of capital per worker, and $$f ( k )$$ represents the per worker
Production function. Also suppose that n represents the population growth rate and d represents
The depreciation rate of capital. The equilibrium level of capital per worker, $$k ^ { * } ,$$ *, will satisfy the
Equation

A) $f \left( k ^ { * } \right) = ( n + d ) k ^ { * }$ .
B) $s z k ^ { * } = ( n + d ) f \left( k ^ { * } \right)$ .
C) $s z f \left( k ^ { * } \right) = ( n + d ) k ^ { * }$ .
D) $f \left( k ^ { * } \right) = \frac { s } { n + d } k ^ { * }$ .
E) $n f \left( k ^ { * } \right) = \frac { s k ^ { * } } { s + d }$ .