单项选择题

______ operate by distributing a workload evenly over multiple back end nodes. Typically the cluster will be configured with multiple redundant load-balancing front ends.

A. High-availability clusters
B. Load-balancing clusters
C. Grid computing

D. Cloud Computing
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单项选择题
（13）是（）

A.format
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单项选择题
Maintenance activities include ______. ①making enhancements to software products ②developing a new software product ③correcting problems ④adapting products to new environments
A. ①②
B. ①③④
C. ②③④
D. ①②③④
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