The Mohorovicic (Moho) Discontinuity is a boundary that separates the Earth`s crust from the mantle. Option 1, which suggests that it separates the outer core and mantle, is incorrect. The outer core is actually located beneath the mantle. Option 2, which suggests that it separates the inner and outer core, is also incorrect. The Moho Discontinuity is not related to the core at all. Option 3, which suggests that it separates the Sima (silicate and magnesium) and Nife (nickel and iron) layers, is also incorrect. The Sima and Nife layers are found within the Earth`s interior but are not directly related to the Moho Discontinuity. Therefore, option 4 is the correct answer as it correctly states that the Moho Discontinuity separates the crust and the mantle.