Explanation:

- Understanding Java as a Partially OOP Language:

- Java is not considered a "pure" object-oriented programming language because it uses primitive data types that are not objects.

- While Java adheres to OOP principles by encapsulating code within classes, the existence of primitive data types breaks the pure OOP model.

- Option Analysis:

- Option 1 - It supports usual declaration of primitive data types: Correct, as the use of primitive types like `int`, `char`, and `double` is the main reason Java is only partially object-oriented.

- Option 2 - It doesn’t support all types of inheritance: Incorrect, since Java supports various inheritance types, including multiple inheritance via interfaces.

- Option 3 - It allows code to be written outside classes: Incorrect, Java enforces all code to be within classes.

- Option 4 - It does not support pointers: While true, this is a safety feature and not related to OOP incompleteness.

- The correct answer is It supports usual declaration of primitive data types from Option 1.