Final answer:
A contraction of binary+ digit is known as a 'bit' and it refers to a variable that can have only two possible values, 0 or 1, which is essential for digital data transmission and computing.
Step-by-step explanation:
The contraction of binary+ digit is 'bit.' A 'bit' is the most basic unit of information in computing and digital communications, which can have only two possible values, typically represented as a 0 or 1. These two possible values correspond to the off or on states of a switch or a single pulse in electronic data transmission, symbolizing the binary nature of data representation in computers.
So, when addressing the question, 'What is a contraction of binary+ digit?' the correct answer is: 1) A variable or computed quantity that can have only two possible values. This definition is crucial as it forms the foundation for more complex data structures in computing and is essential for understanding digital data transmission, such as cell phone conversations and television voice and video images that are converted into a sequence of binary ones and zeros.