1. 2 OR and 1 NAND
2. 2 NAND and 1 OR
3. 2 AND and 1 NOR
4. 2 NOR and 1 NAND
5. 2 NAND and 1 NOR
   
   
   
   

3 is CORRECT. This circuit utilizes alternate symbolic forms for all the gates shown. The first 2 are AND gates (a OR symbol with 3 bubbles), which then feed a NOR gate (a AND symbol with 2 bubbles in the back, also drawn in alternate symbolic form.

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