Which of the followings is NOT a software characteristic?

Answer: The statement "Software is always correct" is NOT a software characteristic.

Reason: Software can contain defects or behave incorrectly if requirements, design, or implementation are flawed. Correctness is a quality goal achieved through careful development and testing, not an inherent guaranteed property.

Common true characteristics of software:

• Software does not wear out — it does not physically deteriorate; faults arise from bugs, environmental changes, or evolving requirements.

• Software is flexible — it can be modified or extended to meet new needs when designed for maintainability.

• Software is not manufactured — it is engineered and created by development activities rather than produced by manufacturing processes.

Summary: Because software can have bugs and its correctness depends on development quality, the claim that it is always correct is false. Therefore that statement is the correct choice for "NOT a software characteristic."