The correct answer would be C. Joe is using the long term memory. This type of memory is maintained or can be hold for a very long period of time. It is any memory that you remember that happened earlier or a few minutes ago. Short term is known to last only for about 18 to 30 seconds only so it should be the long term memory that is working.
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Primary aging
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In my opinion no it is not necessary to do people there doing a good job. But it does make the other person feel better . But you cannot give a person to much glory for then they will only strive to hear good feed back and not be use to hearing constructive negative comments .
