A Permanent Increase in the Long-Run Growth Rate Would Be $A=c N_{A} A$

A permanent increase in the long-run growth rate would be possible if the economy's production function took the form of

A) $A=c N_{A} A$
B) $\Delta A$ = c N_A $\sqrt{A}$
C) $\Delta A=c A \sqrt{N_{A}}$
D) either a, b, or c as long as property rights are protected.
E) neither a, b, nor c, permanent increases are not possible.