Each operation in a demand-driven pipeline can be implemented as an ____ that provides the following functions: open(), next(), and close().
A. Demand
B. Pipeline
C. Iterator
D. All of the mentioned
Answer:A
Each operation in a demand-driven pipeline can be implemented as an ____ that provides the following functions: open(), next(), and close().
A. Demand B. Pipeline C. Iterator D. All of the mentioned
Explanation: After a call to open(), each call to next() returns the next output tuple of the operation.