Let $f ( t ) = \frac { 12 } { 5 + 8 e ^ { - t / 200 } }$

Multiple Choice

Let $f ( t ) = \frac { 12 } { 5 + 8 e ^ { - t / 200 } }$ . Which value of t corresponds to a possible inflection point for f (t) ?

A) $\frac { 5 } { 8 } \ln ( 200 )$
B) $\ln \left( \frac { 5 } { 8 } \right)$
C) $200 \ln \left( \frac { 8 } { 5 } \right)$
D) There is no inflection point.