Which of the following is true about the function y=log4 (x+16)-1?
(1) It has an x-intercept of 4 and a y-intercept of -1.
(2) It has x-intercept of -12 and a y-intercept of 1.
(3) It has an x-intercept of -16 and a y-intercept of 1.
(4) It has an x-intercept of -16 and a y-intercept of -1.