Consider the floor function x defined as being the largest integer k such that kx For example, 2.4=2,1.99=1and2=2 For which of the following domains and codomains is x a function? Z+Z QQ RR+ {1,2,3.5,4.5,6}Z+ {1,2,3,4.5,4.7,5.5}{1,2,3,4,5,6,7} Z+Z+ R+R+ ZZ