Trace: return value

Line 1: def add_one(x):1def add_one(x):
Line 2, indented 1 level: return x + 12    return x + 1
Line 3: 3
Line 4: a = 34a = 3
Line 5: b = add_one(a)5b = add_one(a)
Line 6: c = add_one(b)6c = add_one(b)
Line 7: print(c)7print(c)

Fill in one row each time a line changes a, b or c, or prints something. The table already has the right number of rows. In each row, write only what that line changes; you can leave the other cells empty or copy their values down. Write values the way Python shows them: 3 and 3.0 are different, and text goes in quotes. In the output column, write exactly what appears on screen, with no quotes around it.