Two different functions are represented.
function a:
x- 0,1,2,3,4
f(x)- 5,10,20,40,80

function b- y=4/x

which statement best compares the two functions?

neither function a nor function b has an x-intercept.
neither function a nor function b has a y-intercept.
the domain and range of both functions contain only positive numbers.
the domain and range of both functions contain only positive numbers and zero.