Option B: msfvenom; Option C: Write Your Own

• msfvenom (Metasploit): generates payloads for many platforms with built-in encoders and bad-char avoidance.
• Example concept: choose a payload, set -b for bad bytes, pick an output format.
• Widely fingerprinted — easy for defenders to signature.
• Write your own: maximum control and stealth; smallest size; best learning value.
• Write assembly, assemble, extract .text bytes, test in a tiny harness.