Final answer:
Optimism is not one of the Big Five personality traits. The actual traits include Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism, remembered with the mnemonic OCEAN.
Step-by-step explanation:
Among the options given, all are Big Five personality traits except for optimism. The Big Five traits, which can be remembered with the mnemonic OCEAN, include Openness (imagination and curiosity), Conscientiousness (organization and dependability), Extraversion (sociability and assertiveness), Agreeableness (cooperation and kindness), and Neuroticism (emotional stability and anxiety).
Optimism is not part of the Big Five model; rather, emotional stability is often considered as a factor under Neuroticism, where individuals with high emotional stability are seen as calm and confident versus those with high neuroticism, who may be more anxious and unstable. Optimism could potentially influence these traits but is not itself one of the core traits in the Five Factor Model.