Below is Part A's product structure with lead times. 1. What is the minimum planning horizon for part A? 2. If the lead time for part G was reduced by 50%, what would the new minimum planning horizon be for part A? A LT=5 B LT=5 C D LT=3 LT=10 E LT=3 F LT=5 G LT=18 H LT=10 J LT=12 LT=12 K LT=5 L LT=5 M LT=12