Diffusion in metals can take place through vacancy diffusion (a) and/or interstitial diffusion (b). Which of the following statement(s) is(are) correct? Vacancy Vacancy (a) Position of interstitial Position of interstitial atom before diffusion. atom after diffusion Vacancy diffusion is faster compared to interstitial diffusion Interstitial atoms are more mobile due to their smaller size There are more empty interstitial positions compared to vacancies, hence interstitial diffusion is easier For both types of diffusion, i.e., interstitial or vacancy, rate of diffusion increases with temperature