Apache Spark Certification Practice Test

The selected method demonstrates defining a collection (list) in Python because it uses square brackets to enclose the elements. In Python, a list is a built-in data structure that allows for the creation of a collection of items that can be of different types, including integers, strings, or even other lists. Lists are defined by placing comma-separated values within square brackets, which is precisely what option B illustrates.

The alternative options represent different types of data structures in Python. For instance, the first option uses parentheses, which defines a tuple—a similar collection but immutable, meaning its elements cannot be changed after its creation. The third option uses curly braces, which denotes a set, a collection of unique elements that does not allow duplicates and is also unordered. The fourth option incorrectly uses semicolons to separate elements and is not valid syntax in Python for defining a list or any collection type. Therefore, option B is the correct choice for defining a list in Python.