The correct answer would be employed
Employed means to give a job. If something is employed or used for a particular purpose, it is used for that purpose. In this case, we are referring to the job of a secretary which has been stated clearly therefore, we will use employed in this case.
Endorsed means to declare one's public approval or support. Endorsed seems irrelevant in this scenario. For eg:- The newspaper has endorsed the conservative candidate for a mayor or The actor endorses a new line of clothing
Therefore, employed seems to be the best fit in this case
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