• Impressions and conversions
• Conversion delay and cost-per-acquisition
• Clickthrough rate and cost-per-click
• Impressions, reach, frequency

The correct answer is: Impressions, reach, frequency

Explanation: Once you’ve established your branding campaign’s goals, you can choose the best places to show your ads, and then measure success by monitoring impressions, conversions, and other statistics. Reach is the number of visitors exposed to an ad. Increased reach means that an ad is exposed to more potential customers, which may lead to increased awareness. Frequency is the average number of times a visitor was exposed to an ad over a period of time.
Read more here: https://support.google.com/google-ads/answer/1722064