Consider the following sets: A={a,b,{a,b},{}},B={b,c,d}. What are the cardinalities of: A,B,C={x(xA)(xB)}, and D={x(xA)(xB)}?[4 points ] What is the power set of set A={b,{a,b},{}}.[2 points] Find the cardinality of the following set: E={xN}2x22x is divisible by 3}. [4 points]