Which of the following is a polynomial function?

1. f (x)= 2x²-1
2. f (x)= x/2 + 5 (x/2 fraction po yan)
3. f (x)= 12/x (12/x fraction po yan)

a. 1 only
b. 2 only
c. 1 and 2
d. 2 and 3



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