Most likely B. Photographs.
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Answer: Registers
Explanation:
Registers are small storage locations identified by different types of registers. The function of the register is to provide data for immediate processing to the CPU. These registers hold data temporarily and provide easy access of data to the processor.
In excel spreadsheets, Sidney need to consider specifying relationships between the information you have stored in your spreadsheets when creating formulas. The elements that will help you understand using spreadsheet are the constants, operators, references and functions. This will enable her to use the formulas, without hassle in spreadsheets.