* Why Usefinal?
* Thefinalkeyword ensures that a variable's value can only be assigned once.
* Option B: Assigning the value in the constructor is valid as it allows for flexibility when creating class instances.
* Option C: Assigning the value directly when declaring the variable is also valid for constants.
* Why Not Other Options?
* A: Static variables can have their values reassigned unless marked as final.
* D: Static variables cannot be assigned within a class constructor.
References:Apex Final Keyword:https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_classes_final.htm