To make an n-bit parallel adder how many full adders are required

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To make an n-bit parallel adder how many (minimum) full adders are required ?
a. 1
b. n
c. n-1
d. n+1

Ravi Garg edited question
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    Debjyoti Bhattacharjee (anonymous)

    for first two bit we can use half adder as there will be no carry..

    Debjyoti Bhattacharjee answered
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      Debjyoti Bhattacharjee (anonymous)

      n-1

      Debjyoti Bhattacharjee answered
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        Subham Bhowmick (anonymous)

        if n-1 is the answer, then you can add 1 bit with no adder at all.  I think its n

        Subham Bhowmick answered
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