Difference between various ways of instantiating a delegate (Func<T, T>)?

Func<int, int> myFunc = new Func<int,int>(delegate(int x) {
    return x + 1;
});

Func<int, int> myFunc = delegate(int x) {
    return x + 1;
};

Func<int, int> myFunc = x => x + 1;

c# syntax delegates anonymous-function func