Tell Whether the Set Is Well Defined

Tell whether the set is well defined. If it is not well defined, change it so that it is well defined.
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The set of students attending the University of California.
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__________ (well defined, not well defined)
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a. The set of students attending the University of California.
b. The set of students attending the Massachusetts Institute of Technology.
c. The set of students attending the University of Berkeley.
d. The set of students attending Boston University.
e. None of these because the set is well defined.