The table below shows the functions to represent the sale f(t), in thousands, of four companies in t years.

company a b c d
sale f(t) = 0.87t f(t) = 0.756t f(t) = 1.26t f(t) = 1.09t

which of the following companies showed an exponential growth in sale?

company a and company b
company b and company c
company a and company d
company c and company d

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