A biologist monitors the growth of molds to better understand how they spread. She begins with a culture of 50 molds in a container that can hold 1,000 cultures. Which model represents this scenario?

y = StartFraction 1,000 Over 1 + 50 e Superscript 0.6 t Baseline EndFraction
y = StartFraction 1,000 Over 1 + 19 e Superscript 0.6 t Baseline EndFraction
y = StartFraction 1,000 Over 1 + 50 e Superscript negative 0.6 t Baseline EndFraction
y = StartFraction 1,000 Over 1 + 19 e Superscript negative 0.6 t Baseline EndFraction