Select the appropriate choice

Analyze the following statements in the context of an abstract method in C# and select the appropriate choice.

S1: An abstract method can never be instantiated.

S2: Abstract methods should always have a sealed modifier.

S3: Abstract methods are always implicitly virtual

Options

1. Only S1 and S2 are true
2. Only S2 and S3 are true
3. Only S1 and S3 are true
4. All S1, S2 and S3 are true