Construct a logical and coherent paragraph by arranging the sentences in the correct order:

1. It allows engineers to outline the attributes and behaviors of a component in a software system.

2. Domain-Driven Design (DDD) is a methodology that structures software development around core business models.

3. A fundamental concept within DDD is the "entity," which acts as a blueprint for individual business objects.

4. The key advantage is that it aligns code directly with complex domain logic, simplifying long-term maintenance and updates.

Correct Option: 2, 3, 1, 4

To arrange the given sentences into a logical and coherent paragraph, we can analyze the flow of ideas, topic hierarchy, and pronoun references step-by-step:

Step 1: Identify the introductory sentence
Sentence 2 introduces the overarching subject of the paragraph: "Domain-Driven Design (DDD) is a methodology that structures software development around core business models." Since it presents the broad methodology without relying on prior context, sentence 2 serves as the ideal opening sentence.

Step 2: Narrow down to a key concept
Sentence 3 builds directly upon the broad topic of DDD introduced in sentence 2: "A fundamental concept within DDD is the 'entity,' which acts as a blueprint for individual business objects." Sentence 3 explicitly refers back to "DDD", creating a logical transition from sentence 2 to sentence 3 (2 → 3).

Step 3: Follow pronoun references
Sentence 1 states: "It allows engineers to outline the attributes and behaviors of a component in a software system." The pronoun "It" refers back to the "entity" defined in sentence 3. Describing the utility of an entity makes sentence 1 the natural follower to sentence 3 (3 → 1).

Step 4: Identify the concluding sentence
Sentence 4 provides a high-level summary of the overall benefit: "The key advantage is that it aligns code directly with complex domain logic, simplifying long-term maintenance and updates." Concluding with the key advantage wraps up the paragraph cleanly.

Thus, the correct coherent sequence is 2, 3, 1, 4.