what is an idiom?

a. words, phrases, or expressions that must me signed word for word
b. words, phrases, or expressions whose meaning should be taken literally
c. words, phrases, or expressions whose meaning should not be taken literally.

Guilles is a school administrator. he is talking to board members about the need for five more teachers to be added to the faculty in the next two years. he showed the board a prospective budget and tried to convince them of the importance of his plan. which best lists the skills and knowledge he used to run his meeting? long-term planning skills, skills in math and finance, and a friendly attitude for giving presentations teaching skills, knowledge of educational laws, and a friendly attitude for giving presentations skills in math and finance, organizational skills for track information, and knowledge of information systems research skills for tracking information, long-term planning skills, and knowledge of human behavior