Which expression is equivalent to 1x+1y+1z\frac{1}{x} + \frac{1}{y} + \frac{1}{z}x1+y1+z1?
xyzx+y+z\frac{xyz}{x+y+z}x+y+zxyz
xy+yz+xzxyz\frac{xy+yz+xz}{xyz}xyzxy+yz+xz
1x+y+z\frac{1}{x+y+z}x+y+z1
x+y+zx+y+z\frac{x+y+z}{x+y+z}x+y+zx+y+z