A local phone service provider tracked the exponential growth of their customers, \( y \) , for the past several months, \( x \) , as shown below.
Which statement is not true?
A The initial number of customers when tracking started was \( 400 \) thousand.
B The number of customers is increasing at a rate of \( 5 \% \) each month.
C. They will have over \( 510 \) thousand customers in month \( 5 .\)
D. If this continues, they will have exactly \( 800 \) thousand customers in month \( 20 \) .