a. Deferred is a regular inflected form.
This is known as regular inflection. For example, we usually create the past simple tense of verbs by adding “-d” or “-ed” (as in heard or walked, which also function as the verbs' past participles), and we normally create plurals by adding “-s” or “-es” to the ends of nouns (as in dogs, cats, watches, etc.).
Inflection, the way we change a word's form to reflect things like tense, plurality, gender, etc., is usually governed by consistent, predictable rules. This is known as regular inflection.
Inflections in English grammar include the genitive 's; the plural -s; the third-person singular -s; the past tense -d, -ed, or -t; the negative particle 'nt; -ing forms of verbs; the comparative -er; and the superlative -est
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