A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of the preparation stage. It sets up the context without going into details. It does not use any pronouns or definite articles that refer to previous information. Why other lines are not chosen? Paragraph 2 starts with "Installation" which is not an independent topic. Paragraph 3 uses "With the software" which refers back to something not yet mentioned. Paragraph 4 starts with "Installation begins" which is not a general statement. Paragraph 5 starts with "Following the successful installation" which assumes prior knowledge.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it wraps up the process by discussing the final tests after installation. It summarizes the overall theme of ensuring the software works correctly.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): This pair connects because the first paragraph talks about preparation, and the second paragraph describes the next step, which is installation. This shows a logical order of actions.
• Pair 2 (Paragraph 2 → Paragraph 3): This pair connects because the second paragraph talks about the installation process, and the third paragraph explains what happens after the installation. This shows a clear progression from installation to configuration.
• Pair 3 (Paragraph 3 → Paragraph 4): This pair connects because the third paragraph discusses configuration, and the fourth paragraph explains the next step of setting up workstations. This shows a logical order of tasks.
• Pair 4 (Paragraph 4 → Paragraph 5): This pair connects because the fourth paragraph talks about setting up workstations, and the fifth paragraph describes the final step of testing the software. This shows a clear sequence of actions.