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Why is this an issue?
There’s no point in forcing the overhead of a method call for a method that always returns the same constant value. Even worse, the fact that a
method call must be made will likely mislead developers who call the method thinking that something more is done. Declare a constant instead.
This rule raises an issue if on methods that contain only one statement: the return of a constant value.
Noncompliant code example
int GetBestNumber()
{
  return 12;  // Noncompliant
}

Compliant solution
const int BestNumber = 12;

or
static readonly int BestNumber = 12;