What form or rule is demonstrated in this sentence?

Question

The plan was this: divide the troops, surround the enemy, and capture the headquarters.
colon used to divide two clauses
commas between adjectives preceding a noun
colon used before a list of items

Answer 1

The sentence demonstrates the use of a colon before a list of items. In this case, the colon introduces a series of actions (divide the troops, surround the enemy, and capture the headquarters) that make up the plan.