Choose the correct statement. The work function

The photon penetrates a distance of about 10^-8 m before it is absorbed. It imparts all its energy to a single electron. The energy of photon goes in two parts: a part of energy is used in releasing the electron from the metal surface, this energy is called work function and the remaining part appears in the form of kinetic energy of the same electron. The work function is the characteristic of the metal and it will vary from metal to metal.