Let A={x∈R:1≤x≤3}A = \{x \in \mathbb{R} : 1 \le x \le 3\}A={x∈R:1≤x≤3} and B={x∈R:4<x<7}B = \{x \in \mathbb{R} : 4 < x < 7\}B={x∈R:4<x<7} be intervals on the real number line. What is their intersection A∩BA \cap BA∩B?
[3,4][3, 4][3,4]
∅\emptyset∅
{3,4}\{3, 4\}{3,4}
[1,7)[1, 7)[1,7)