Cognitive scientist: Using the pioneering work of comparative psychologist Gordon Gallup as a model, several studies have investigated animals' capacity for mirror self-recognition (MSR). Most animals exposed to a mirror respond only with social behavior, such as aggression. However, in the case of the great apes, repeated exposure to mirrors leads to self-directed behaviors, such as exploring the inside of the mouth, suggesting that these animals recognize the reflection as an image of self. The implication of these studies is that the great apes have a capacity for self-awareness unique among nonhuman species. The cognitive scientist makes which of the following assumptions in the argument above? ['If an animal does not have the capacity for MSR, it does not have the capacity for self-awareness.', 'When exposed to a mirror, all animals display either social behavior or self-directed behavior.', 'Animals that do not exhibit MSR may demonstrate a capacity for self-awareness in other ways.', 'If a researcher exposes an animal to a mirror and that animal exhibits social behavior, that animal is incapable of being self-aware.']