Which of the following statements is correct in the context of hearing impairment? 

1
Hearing impairment can affect a child's ability to communicate effectively.
2
All children with hearing impairment need to use 'sign language' to communicate.
3
Hearing impairment of a child can be reliably tested by making loud noises near the child.
4
Hearing impairment is always due to a physical problem with the ear.

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