Old age hath yet his honour and his toil; death closes all; but something ere the end, some work of noble note, may yet be done, not unbecoming men that strove with gods. the lights begin to twinkle from the rocks: the long day wanes: the slow moon climbs: the deep moans round with many voices. come, my friends, ‘tis not too late to seek a newer world. push off, and sitting well in order smite the sounding furrows; for my purpose holds to sail beyond the sunset, and the baths of all the western stars, until i die. it may be that the gulfs will wash us down: it may be we shall touch the happy isles, and see the great achilles, whom we knew. tho’ much is taken, much abides; and tho’ we are not now that strength which in old days moved earth and heaven; that which we are, we are; one equal temper of heroic hearts, made weak by time and fate, but strong in will to strive, to seek, to find, and not to yield

. source: tennyson, alfred. “ulysses.” the early poems of alfred, lord tennyson. london: edward moxon, 1842. project gutenberg. 2005. web. 7 june 2011.

which of the following describes the structure of this excerpt best?
free verse
sonnet
ballad
blank verse