Which of the following is true regarding object keys in JavaScript?
- Object keys must be unique within an object.
- Object keys can only be of type string.
- Object keys are case-sensitive.
- Object keys can only be integers.
Object keys in JavaScript are case-sensitive. This means that keys with different letter casing (e.g., 'key' and 'Key') are considered distinct in an object. The other options do not accurately describe the behavior of object keys.
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