What key language indicates that a verification upon oath is required?

The key language that indicates a verification upon oath is required is "Signed and sworn to before me." This phrase clearly denotes that the individual not only signed the document but also did so in the presence of a notary public while taking an oath. This process of swearing affirms the truthfulness and accuracy of the statements made in the document, establishing that they are made under penalty of perjury.

The inclusion of "sworn to" specifically signifies that the individual is making a formal declaration, which is a crucial element of the verification process. In contrast, other phrases may suggest acknowledgment or witnessing but do not necessarily imply an oath has been taken. For example, "Acknowledged before me" simply indicates recognition of the signature without the additional requirement of an oath.