Let A={a,b}A = \{a, b\}A={a,b}. Which of the following is a subset of the power set P(A)\mathcal{P}(A)P(A)?
{{a},{b}}\{\{a\}, \{b\}\}{{a},{b}}
{a,b}\{a, b\}{a,b}
{a}\{a\}{a}
{{a,c}}\{\{a, c\}\}{{a,c}}