Does it matter which type of increase you use if the pattern doesn't specify? The pattern only says
BACK: With smaller needles, cast on 76 (80, 86) sts.
Work in ribbing (k 1, p1) for 2 inches. Inc 6 (7, 6) sts evenly across last Row - 82 (87, 92) sts.
This is the sweater I am making http://www.knitting-crochet.com/coolcot.html
, which increase would you use?