PPD-21 recommends critical infrastructure owners and operators contribute to national critical infrastructure security and resilience efforts through a range of activities, including all of the following EXCEPT: A. Establish continuity plans and programs that facilitate the performance of lifeline functions during an incident
B. Sponsor critical infrastructure security and resilience-related research and development, demonstration projects, and pilot programs
C. Develop and coordinate emergency response plans with appropriate Federal and SLTT government authorities
D. Perform critical infrastructure risk assessments; understand dependencies and interdependencies; and develop emergency response plans

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It is widely assumed that people need to engage in intellectual activities such as solving crossword puzzles or mathematics problems in order to maintain mental sharpness as they age. in fact, however, simply talking to other people—that is, participating in social interaction, which engages many mental and perceptual skills—suffices. evidence to this effect comes from a study showing that the more social contact people report, the better their mental skills. which of the following, if true, most seriously weakens the force of the evidence cited? (a) as people grow older, they are often advised to keep exercising their physical and mental capacities in order to maintain or improve them. (b) many medical conditions and treatments that adversely affect a person's mental sharpness also tend to increase that person's social isolation. (c) many people are proficient both in social interactions and in solving mathematical problems. (d) the study did not itself collect data but analyzed data bearing on the issue from prior studies. (e) the tasks evaluating mental sharpness for which data were compiled by the study were more akin to mathematics problems than to conversation.