If these citations appeared after a trial court decision, which one means that the decision was sent back for further consideration? a. aff'd 633 f.2d 512 (ca-7, 1980)b. rev'd 935 f.2d 203 (ca-5, 1991)c. aff'd 914 f.2d 396 (ca-3, 1990)d. rem'd 399 f.2d 800 (ca-5, 1968)