Final answer:
The step not considered to be part of the data processing cycle is 'Feedback from external sources'. This step is not a typical phase in the cycle as the standard steps include Data input, Data storage, Data processing, and Data output.
Step-by-step explanation:
The step that is not considered to be part of the data processing cycle is b. Feedback from external sources. The standard data processing cycle typically includes the following steps: Data input, where data is collected and entered into the system; Data storage, which involves saving data in a database or other storage system; Data processing, where the data is transformed or calculations are performed; and Data output, the production of the processed data into a usable format. Feedback from external sources is not a typical phase in the cycle, as it may involve acting on the results of data processing rather than handling the data itself.