How can you combine class instance variables with inheritance to have each subclass track its own count of instances created?

hard📝 Application Q9 of 15

Ruby - Class Methods and Variables

ADefine @count only in the parent class and increment it in initialize.

BUse a single @@count variable shared by all subclasses.

CDefine @count in each class and increment it in initialize using self.class.instance_variable_set.

DUse a global variable to track counts per subclass.

Step-by-Step Solution

Solution:

Step 1: Understand class instance variables are separate per class
Each subclass has its own @count variable if defined separately.
Step 2: Increment @count in initialize using self.class
Using self.class.instance_variable_set/get allows each subclass to update its own count.
Final Answer:
Define @count in each class and increment it in initialize using self.class.instance_variable_set. -> Option C
Quick Check:
Subclass tracking with class instance vars = Define @count in each class and increment it in initialize using self.class.instance_variable_set. [OK]

Quick Trick: Each subclass has own class instance vars, increment via self.class [OK]

Common Mistakes:

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