Which of the following is NOT a method for opening a cockpit?

The correct response identifies a method that is not typically used for opening a cockpit. A cockpit may be opened manually through physical handles, hydraulically by utilizing hydraulic systems that accommodate the opening mechanism, or electrically using motors and switches. These methods are designed for efficient and safe operation during standard procedures.

However, hydraulically is not an appropriate method listed as "not" used because hydraulic mechanisms are indeed a standard method for complex aircraft, so choosing this option would not accurately represent the purpose of the question. The correct answer refers to forcibly opening a cockpit, which is not a standard or officially sanctioned method. Forcibly opening a cockpit would imply an emergency situation or a breach of normal procedures, which contradicts the protocols followed for safe operations on most aircraft. Thus, identifying forcibly as the method that is not a standard practice aligns with safe aviation standards.