Step 1: Define Terabyte (TB).
A terabyte is a unit of digital information storage. Conventionally, 1 Terabyte = 1000 Gigabytes or, in binary terms, bytes (1024 Gigabytes).
Step 2: Evaluate the options.
(A) Light wave: Measured by wavelength (e.g., nanometers) or frequency (e.g., Hertz).
(B) Speed of aircraft: Measured in units of distance per time (e.g., kilometers per hour, knots).
(C) Computer memory: This includes RAM and storage devices like hard drives (HDDs) and solid-state drives (SSDs), which are measured in Bytes, Kilobytes (KB), Megabytes (MB), Gigabytes (GB), and Terabytes (TB).
(D) Bandwidth: Data transfer rate is measured in bits per second (bps) or Bytes per second (Bps) and their multiples (e.g., Mbps, Gbps).
Thus, a Terabyte is a unit for measuring computer memory and data storage capacity.