[4%] You are given a Bloom filter with the three hash functions as follows, where $modf(\cdot)$ returns the fractional part of a floating point number.

$f_1(x) = floor(modf(x*0.31)*16)$ $f_2(x) = floor(modf(x*0.24)*16)$ $f_3(x) = floor(modf(x*0.13)*16)$

Which of the followings is (are) true?