D. Anti-DDoS Service Pro If you need to maintain service availability at 99.9% or higher under DDoS attacks, the most suitable Alibaba Cloud product is Anti-DDoS Service Pro. This is the premium DDoS protection service provided by Alibaba Cloud and offers advanced features and capabilities to protect your online services from various DDoS attacks. It provides higher mitigation capacities and more comprehensive protection compared to Anti-DDoS Service Basic, making it suitable for maintaining higher availability levels during DDoS attacks.

D. Anti-DDoS Service Pro SERVICE LEVEL AGREEMENT We shall use commercially reasonable endeavors to provide a Monthly Uptime Percentage of no less than 99.9% each calendar month in connection with your use of the Service (the “Service Guarantee”).

Answer is D

Anti-DDoS Pro and Anti-DDoS Premium use high-availability network protection clusters to prevent single point of failures and redundancy. The processing capabilities of Anti-DDoS Pro and Anti-DDoS Premium can be scaled up. They also offer automatic detection and attack policy matching to provide real-time protection and a scrubbing service availability of up to 99.99%. https://www.alibabacloud.com/help/en/ddos-protection/latest/what-are-anti-ddos-pro-and-anti-ddos-premium