The function f(x) = –1∕3x2 is shifted down one unit. Which of the following function equations represents this translation? A)

f(x) = –1∕3x2 + 1

B)

f(x) = –1∕3(x – 1)2

C)

f(x) = –1∕3(x + 1)2

D)

f(x) = –1∕3x2 – 1