Which adjective best describes how the Necessary and Proper Clause of the U.S. Constitution is often interpreted by the federal government?

Responses

brittle, meaning that it falls apart when used in a legal argument
brittle, meaning that it falls apart when used in a legal argument

elastic, meaning it can be expanded as needed
elastic, meaning it can be expanded as needed

watery, meaning that it has very little substance left after being added to
watery, meaning that it has very little substance left after being added to

sticky, meaning that, once it has been used, it never goes away

sticky, meaning that, once it has been used, it never goes away