Welfare officer under (sec 49) and safety officer under sec (40b) of the Factories Act. Do we need to hire both looking at the number of workmen?

Hi, I had a query regarding the welfare officer under (sec 49) and safety officer under sec (40 b) of the Factories Act. Do we need to hire both looking at the number of workmen? If the answer is yes then what will be the JD of safety officer and welfare officer. If the answer is no then how to manage the JD and which one is more important.
Looking at the current scenario what best can be done and what are the other options. Please give your valuable inputs.
Thanks in advance to all.

Please furnish the number of workmen deployed at your factory, to enable the Forum to
give a reply in this matter.

Thanks for the reply sir.
number of workmen is 1100.

As per relevant provisions of Factories Act, if the strength of workmen is 1000 or more, you need to appoint a Safety Officer (Sec.40(b) and if the strength of workmen is 500 or more, you need to appoint a Welfare Officer (Sec.49).
Considering the number of workmen as 1100 in your factory, your factory must have both
Welfare Officer and Safety Officer.