Blitzkrieg used a combination of

Blitzkrieg, (German: “lightning war”) military tactic calculated to create psychological shock and resultant disorganization in enemy forces through the employment of surprise, speed, and superiority in matériel or firepower. Blitzkrieg is most commonly associated with Nazi Germany during World War II even though numerous combatants used its techniques in that war. Its origins, however, can be traced to the 19th century, and elements of blitzkrieg have been used in present-day conflicts.

Ibelieve the answer is d