The one that is not a high-level optimization is peephole optimization. The correct option is a.
What is high-level optimization?
In applications created in high-level programming languages, HLO makes use of the properties of source code constructs (such as loops and arrays). Techniques for loop transformation in HLO include loop permutation and loop exchange.
The -O flag determines how much the compiler will optimize the code it produces. The compiler generates straightforward code without any reordering of instructions or other performance optimizations in the absence of any version of the -O flag.
Therefore, the correct option is a. peephole optimization.
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