To invoke the LISP system, you must enter
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AI
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LISP
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CL (Common Lisp)
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both b and c
D
Correct answer
Explanation
To invoke a LISP system, you enter either 'LISP' for standard LISP implementations or 'CL' specifically for Common Lisp environments. Both commands are valid entry points to start programming in the LISP language family.