Which of the following choices are the best labels for this amino acid? 
Definitions:
Presale Testing
The evaluation of products or services before they are made available for sale to assess their market potential and customer response.
Probability
The likelihood of an event occurring, depicted as a number anywhere between 0 and 1.
Manic-depressive Illness
A bipolar disorder marked by extreme mood swings, including episodes of mania and depression, affecting a person's energy and functionality.
Mean Number
The average value obtained by dividing the sum of all numbers in a set by the quantity of numbers in that set.
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