HTML comments can be used to _____ sections of code for testing purposes.

'disable'
'highlight'
'modify'
'run'

HTML comments can be utilized to 'disable' sections of the code. When developers are troubleshooting or testing changes to a web page, they might want to temporarily disable certain sections without deleting them. By placing the code inside HTML comment tags, it's effectively made invisible and non-executable to browsers, thus disabling it without removing it.

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