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An SR latch is implemented using TTL gates as shown in the figure. The set and reset pulse inputs are provided using the push-button switches. It is observed that the circuit fails to work as desired. The SR latch can be made functional by changing

1. NOR gates to NAND gates
2. inverters to buffers
3. NOR gates to NAND gates and inverters to buffers
4. $5\: V$ to ground