Which of the following is NOT a method of detonation?

The correct answer is based on the distinction between methods of detonation and mechanisms of initiating an explosion. Command detonation, remote-controlled detonation, and time delay detonation all represent specific techniques used to trigger explosives. These techniques involve control over when and how an explosive device is set off, utilizing either a direct command, some form of remote activation, or a mechanism that releases the explosive after a specific period.

On the other hand, shockwave detonation refers to the propagation of an explosive reaction through a shockwave created by an explosive material. It does not represent a method of initiation but rather describes the phenomenon that occurs once an explosive has been triggered. This makes it fundamentally different from the other options listed, which focus on the intentional and controlled means of initiating an explosion. Understanding this distinction helps clarify why shockwave detonation does not fit within the category of methods for how detonations are carried out.