Let A={1,{2,3},4}A = \{1, \{2, 3\}, 4\}A={1,{2,3},4}. Which of the following statements is mathematically true?
2∈A2 \in A2∈A
{2,3}⊆A\{2, 3\} \subseteq A{2,3}⊆A
{2,3}∈A\{2, 3\} \in A{2,3}∈A
{1,4}∈A\{1, 4\} \in A{1,4}∈A