ref and out parameters in C# and cannot be marked as variant

Question

What does the statement mean?

From here

ref and out parameters in C# and cannot be marked as variant.

1) Does it mean

Answer 1

It means you can't have the following declaration:

public delegate R MyDelegate(ref A arg);

Edit: @Eric Lippert corrected me that this one is still legal:

public delegate void MyDelegate(A arg, out R s);

It actually makes sense, since the R generic parameter is not marked as a variant, so it doesn't violate the rule. However, this one is still illegal:

public delegate void MyDelegate(A arg, out R s);