What is a key characteristic of arrays in many programming languages?

What is a key characteristic of arrays in many programming languages?

• A. You can directly access any element using its index.
• B. Elements must be accessed sequentially only.
• C. It stores elements in key-value pairs.
• D. It cannot be resized after creation.

Answer: (A)

Direct access to elements by index is the defining trait of arrays. Because elements are stored in a known, fixed order, you can retrieve any item instantly using its numeric position, typically in constant time. This is what sets arrays apart from structures that require traversal or that store data as key-value pairs. The other statements describe either a limitation not inherent to arrays or refer to data structures with different access models (like maps) or to resizing behavior that depends on the language and array type.

Direct access to elements by index is the defining trait of arrays. Because elements are stored in a known, fixed order, you can retrieve any item instantly using its numeric position, typically in constant time. This is what sets arrays apart from structures that require traversal or that store data as key-value pairs. The other statements describe either a limitation not inherent to arrays or refer to data structures with different access models (like maps) or to resizing behavior that depends on the language and array type.