Refer to the accompanying figure. 
In the figure, a business cycle trough is shown by which point(s) ?
Definitions:
William Syndrome
A genetic disorder characterized by developmental delays, cardiovascular disease, and distinctive facial features, often with a friendly personality.
Autism Spectrum Disorder
A developmental disorder characterized by difficulties with social interaction and communication, and by restricted or repetitive patterns of thought and behavior.
Autism
A developmental disorder characterized by difficulties with social interaction, communication, and restricted or repetitive behaviors.
Neural Darwinism
Hypothesis that the processes of cell death and synaptic pruning are, like natural selection in species, the outcome of competition among neurons for connections and metabolic resources in a neural environment.
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