WWI tanks used to be split into two groups according to what?

Here is the question :

WWI TANKS USED TO BE SPLIT INTO TWO GROUPS ACCORDING TO WHAT?

Here is the option for the question :

• Color
• Gender
• Size
• Country

The Answer:

And, the answer for the the question is :

Explanation:

[STC0012022]. During World War I’s bloody Battle of the Somme, tanks were first used in combat. The dangerous vehicles were originally divided into male and female categories. Tanks equipped with cannons were deemed masculine, while those with machine guns were seen as feminine.