Autism Spectrum Disorder (ASD) refers to a range of conditions characterised by:
1. Some degree of impaired social behaviour
2. Communication and language issues
3. Narrow range of interests and activities
4. Mental retardation
Select the correct answer using the code given below:
1
1, 2 and 3 only
2
2, 3 and 4 only
3
1 and 4 only
4
1, 2, 3 and 4