What is the effect of the repetition of the phrase "and nothing more" in Stanzas 1-7? It emphasizes that the narrator keeps thinking there is something outside but finds nothing.

It creates relief that the narrator doesn't find anyone at his bedroom door.

It helps build tension each time the narrator tries to determine what is making the tapping sound.

It foreshadows the line "Quoth the Raven 'Nevermore'" in the stanzas in the second half of the poem.