Question: 2)Which string declaration below are valid? (check all that apply) string str = ; string str = 1 2 3; string str = hello; string

2)Which string declaration below are valid? (check all that apply)

string str = "";

string str = "1 2 3";

string str = "hello";

string str = "Hi there";

string a = "str";

string str = "A";

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