Which of the following statements about matrices is true?

A matrix is a rectangular array of numbers, symbols, or expressions, organized in rows and columns. While many matrices are indeed two-dimensional, they can extend into more dimensions, such as three-dimensional or higher. This concept is particularly applicable in fields like advanced mathematics and computer science, where tensors (which generalize the concept of matrices) are often used to process data in multidimensional formats.

The possibility of having matrices with dimensions beyond two is essential in various applications, including multi-variable statistics, machine learning, and physics, where relationships between three or more variables need to be examined. The flexibility of matrices to accommodate multiple dimensions makes them powerful tools for handling complex data structures.