Starting a Lisp environment: Which command names are commonly used to invoke the Lisp system on typical installations?

Introduction / Context:
Different Common Lisp implementations provide launch commands that reflect either the language (LISP/CL) or a vendor-specific binary name. The question checks recognition of generic invocation names across platforms.

Given Data / Assumptions:

• We focus on generic, language-oriented command names.
• Implementations vary: SBCL, CLISP, Allegro, CMUCL, etc.
• Historically, commands like ‘‘lisp’’ or ‘‘cl’’ have been common wrappers.

Concept / Approach:
While many vendors use their own executable names (e.g., sbcl, clisp), generic entry points often include ‘‘lisp’’ or ‘‘cl’’. Therefore, acknowledging both ‘‘LISP’’ and ‘‘CL’’ covers standard, language-centric invocations.

Step-by-Step Solution:

Verification / Alternative check:
On Unix-like systems, symlinks ‘‘lisp’’ or ‘‘cl’’ are frequently provided; Windows shortcuts likewise reflect these names for certain distributions.

Why Other Options Are Wrong:

• ‘‘AI’’ is not a standard shell command for Lisp.
• ‘‘None of the above’’ contradicts widely used command names.

Common Pitfalls:
Assuming a single universal executable; in practice, vendor names vary, but ‘‘lisp’’ and ‘‘cl’’ remain common generic launchers.

Final Answer:
Both b and c