a) What is a 'phoneme'? Illustrate your answer with TWO examples from English. (4 marks) b) Identify and correct the consonant sound errors in the following words as commonly mispronounced by speakers of Nigerian English. Write the correct phonemic transcription of each word: (i) thin (ii) this (iii) church (iv) vision (v) sing (6 marks) c) Explain the difference between voiced and voiceless consonants and give TWO examples of each. (6 marks)