complementation of language

Question

I have a language L = {ε,a}. What will be $L^{C}$? Will it be Φ or {aa, aaa, aaaa, ...} ? 

Answer 1

if Sigma = {a} then

L’ = Sigma* – L = {a}* – {e,a} = {aa,aaa,aaaa,...} = aaa*