(a) Which of the following impedance functions can be realised as a resistorcapacitor (RC) network? Justify your answer. F1(s)=(s+1)(s+5)(s+2)(s+6);F2(s)=(s+5)(s+6)(s+3)(s+4) [4 marks] (b) Synthesise Z(s)=s(s2+2)s4+5s2+3 as an inductor-capacitor (LC) network using Cauer 1st form