Identify the level within a database system (user, programmer of application software, designer of the DBMS software) at which each of the following concerns or activities occur:
a. How should data be stored on a disk to maximize efficiency?
b. Is there a vacancy on flight 243?
c. How should a relation be organized in mass storage?
d. How many times should a user be allowed to mistype a password before the conversation is terminated?
e. How can the PROJECT operation be implemented?
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