The dictionary operation that you use to remove all the keys within the dictionary-named contacts is contacts.clear().
<h3>What is dictionary add and remove element from dictionary?</h3>
The act of Removing elements from Dictionary is one that can delete a specific item in a dictionary by the use of the pop() method.
Note that this method deletes an item with the given key and returns the value .
Hence, The dictionary operation that you use to remove all the keys within the dictionary-named contacts is contacts.clear().
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Answer:b) Master reference file(MRF)
Explanation: Master reference file is the collection of data that persist the schedules records for the maintenance and administration. It is the UDC version tool .
It helps in the managing the data content present in the database, archiving and tracing any changes on the database over certain time.Master data management is the managing of data's integrity .It send the collected critical data to the master reference files.
Other given options are incorrect because backup file is for creating data backup, central directory is record of the data of users and other information and data silo is kind of fixed data having the governance of any organization.Thus, these factors don't help in the critical information management.Thus, the correct option is option(b).
