How do Standard duplicate rules become accessible in the salesforce?

Answer options:

A.Based on permission set rules
B.If you have a salesforce.com org that was created in the spring’15 or later
C.If you have a salesforce.com org that was created in the summer’15 or later
D.For enterprise customers only

Correct Answer: B 
Standard duplicate rules became accessible to the users who have a salesforce org that was created in spring’15 or later. 
Other options are incorrect because the functionality became available in the spring’17 release and it has nothing to do with permission set or the type of salesforce that you have whether enterprise or unlimited or professional. 
References: 

https://www.salesforce.org/duplicate-management-nonprofit-starter-pack/

Correct Answer: B 
Standard duplicate rules became accessible to the users who have a salesforce org that was created in spring’15 or later. 
Other options are incorrect because the functionality became available in the spring’17 release and it has nothing to do with permission set or the type of salesforce that you have whether enterprise or unlimited or professional. 
References: 

https://success.salesforce.com/answers?id=9063A000000l9f0QAA