When Survey Researchers Write Closed-Ended Questions, They Often Use Likert

When survey researchers write closed-ended questions, they often use Likert scales to construct the possible answers. How do Likert scales allow respondents to answer?

A) They allow respondents to answer along a continuum, from "strongly agree" to "strongly disagree."
B) They allow respondents to answer with their own opinions.
C) They allow respondents to answer in simple dichotomies, like true/false or yes/no.
D) They allow respondents to opt out of a question if they don't have an answer.
E) They encourage respondents to include detailed responses.