Which of the following is NOT a programming concept in the object-oriented paradigm?

In the context of the object-oriented programming (OOP) paradigm, encapsulation is a key principle that refers to the bundling of data and methods that operate on that data within a single unit or class. This principle promotes data hiding and helps to protect the integrity of the object's state by controlling access to its internal workings through well-defined interfaces.

When considering the other options, pointers and arrays are concepts that, while they may be used in conjunction with OOP languages, do not inherently reflect the core principles of the object-oriented paradigm. Pointers are a low-level programming concept primarily concerned with memory addresses in languages such as C or C++, rather than the high-level abstractions typically utilized in OOP. Arrays are data structures that store collections of items, which can be used in many programming paradigms beyond OOP.

In contrast, interpreters are tools used to execute code written in high-level programming languages, but they are not concepts of OOP on their own. Thus, the concept that stands out as not belonging to the foundational ideas of object-oriented programming is the interpreter, making it the correct answer to the question.