Option B is the correct answer, Employers have flexibility in choosing a fall protection system they believe will work best in a situation selected. It is the primary duty of employer to provide safety to its workers. Employers must setup a suitable protection system at workplace from falling off from overhead platforms and from elevated workstations during construction for safety of its employees.  
Further Explanation:
⦁	Employer must ensure compliance to OSHA-Fall protection in construction.
⦁	Generally, fall protection must be ensured by deploying guardrail systems at the edge of construction sites, safety systems built by nets or personal fall arrest.
⦁	OSHA requires to built fall protection system irrespective of fall distance to make sure safety conditions for workers/ employees.
Answer details:
Grade: High School
Subject: Computer Science and Technology.
Learn More:
Fall protection and compliance to OSHA rules and regulations
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Employer responsibility in providing fall protection
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Key Words: Fall protection, OSHA, workplace safety, guardrail systems etc.
Image of guardrail as an example is attached.
 
        
                    
             
        
        
        
#1 is A and #2 is B, but I don't know about #3 and #4.
        
             
        
        
        
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Answer:
https://www.python.org/about/gettingstarted/
Explanation:
its a site i used