Read the following research paper excerpt and answer the question.
According to Mario Pei, slang is common to English as well as to foreign languages (80). Many
words that were once considered slang are now words of full, legitimate standing in our
language. Some of these words are strenuous, spurious, clumsy, and bogus. Even Shakespeare
introduced into current usage such slang terms of his day as hubbub, fireworks, fretful, (to)
bump, and (to) dwindle. Pei estimates that about 90 per cent of all slang worvis eventually
become permanent (Johns 12).
What types of language has the author used?
He is using informal language.
He is using formal language.
He is using critical language.
He is using objective language.