These are the set of information write an or president by authors who did not personal witness an event or occurrence a. up-to-date b. primary sources
c. relevant sources
d. secondary sources

d. secondary sources​

Explanation:

Information can be defined as processed data that can be used to perform specific tasks or job functions. The two (2) main sources of information are;

I. Primary source: this type of source comprises of raw information that are first-hand in nature i.e a personal experience or witness of an event (occurrence).

II. Secondary source: this type of source relies solely on the primary source for its information and as such it comprises of second-hand information provided by other authors or researchers.

Hence, secondary sources are the set of information written about a president by authors who did not personally witness an event or occurrence with respect to the president.

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lets none because you provide no details.