Question:What is composer.lock file used for? 

A It is used to contain information about the state of the installed composer package at the time when packages were first installed and/or updated. 
B It is used to contain information about the state of the installed composer package at the time these packages were last installed and/or updated. 
C It is used to lock all the packages so that it would never change later. 

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B 

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Mohammad Towhidul Islam

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