Mathematical Science Algebra Group & Subgroups

Which of the following is a subgroup of (C, +).

1
(ℝ, +)
2
(G, +), where G = {π, r |r ∈ ℚ} 
3
(G, +), where G = {i, r |r ∈ ℝ}
4
(G, +), where G = {πn |n ∈ ℤ}
5
Question Not Attempted

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