WHS Regulation applicable to NSW Australia. Answer the following questions related to record-keeping requirements that must be reflected in an organisation's policy and procedures. 

a) Identify four types of records that must be maintained according to the WHS regulation applicable to your state/territory. 

b) Identify the minimum period requirement for maintaining each of the following WHS records 

i. WHS training records 

ii. Risk assessments

iii. Health monitoring records