Regarding the characteristics of the four disaster recovery modes of active-active, hot standby, warm standby, and cold standby, which of the following statement is wrong?

Regarding the characteristics of the four disaster recovery modes of active-active, hot standby, warm standby, and cold standby, which of the following statement is wrong?
A . The RTO time of the data center adopting the cold standby mode is long and unpredictable.
B. The data center with the active-active mode has the shortest RTO time.
C. When the service is unavailable due to a data center failure, the hot standby and active-active modes can automatically switch services with software, while the warm standby mode requires manual intervention, and the cold standby mode requires strong manual intervention.
D. Hot standby mode requires the highest software cost.

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Answer: D