Modals are one of the trickiest structures that students learning English as a Second Language have to cope with. Bearing this in mind, choose the option that best defines the concept of "modal":

Modals are tenseless auxiliaries used by speakers to add a more objective perspective to their propositions.

Modals are multiword forms often employed to make categorical assertions.

Modals are tenseless auxiliaries used by speakers to add a more subjective perspective to their propositions.

 Modals are inflected to bear the marks of tense and subject-verb agreement.

Modals are tensed auxiliaries that have carried inflections since earlier stages of the language.