Do two searches mapped to Subject Heading (one for "Radiography, Dental" and one for "Pregnancy"), and then combine the two searches using "AND"

Imagine you are doing research on dental radiography during pregnancy or breastfeeding. You do three separate searches mapped to Subject Heading (one for "Radiography, Dental", one for "Pregnancy", and one for "Breast Feeding"). How should you then combine the three searches?

• Combine Radiography, Dental AND Pregnancy AND Breast Feeding
  
• Combine Radiography, Dental OR Pregnancy OR Breast Feeding
  
• Combine Pregnancy OR Breast Feeding, and then combine these previously combined searches AND Radiography, Dental
  

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