Three groups of rats acquire a memory on day 1. On day 2, rats in group 1 are given a drug that prevents initial long-term storage while they are actively retrieving the memory. Rats in group 2 receive the drug but do not engage in memory retrieval. Rats in group 3 actively retrieve the memory and are shocked 6 hours later when they are not engaged in retrieval. On day 3, all three groups are assessed. Which group will show the GREATEST impairments in memory