Which of the following best describes germany's military strategy at the start of world war II

Attack with a combination of speed and overwhelming force

Explanation:

The German military used the combined arms of air, tanks, and infantry to inflict major damage concentrated in a spearhead assault in one or a few areas of the front. These were known as the lightning war years and blitzkrieg was not used later in the war, at least not in the same way. The complete opposite would be the USSR tactic of a long and stretched war of attrition designed to wear the enemy out.