The five traits that have been found to be the set of traits leaders must have to be considered leaders are $\_\_\_\_\_\_.$ a$.$ there is not a set of traits that all leaders must have b$.$ self$-$confidence, social judgment, integrity, determination, extraversion c$.$ intelligence, sociability, self$-$confidence, integrity, determination d$.$ there is a set of leader traits that all leaders must have, just not those listed above