Consider the following code snippet:

namespace ExtensionMethods
{
public static class NumericExtensionMethods
{
  public static bool IsNumeric(this string s)
  {
    float output;
    return float.TryParse(s, out output);
  }
}
}

After adding the namespace, how will you call the ExtensionMethod on the string if your string variable is defined as:
string test="4";

1. test.IsNumeric();

2. ExtensionMethods.NumericExtensionMethods.IsNumeric();

3. NumericExtensionMethods m = new NumericExtensionMethods();m.IsNumeric(test);

4. None of the above