The equation gives the estimated number of online newsletter subscribers at the end of every six-month period, x, starting from the end of January 1991, where 0≤x≤4. Which statement is the best interpretation of the y-intercept of the graph of this equation in the xy-plane?
The estimated number of online newsletter subscribers at the end of the first six-month period was 500.
A
The estimated number of online newsletter subscribers at the end of January 1991 was 500.
B
The estimated number of online newsletter subscribers at the end of January 1992 was 1,500.
C
The estimated number of online newsletter subscribers at the end of January 1991 was 1,500.