Pick up the correct statement from the following:

• An extra width of 7.5 cm ballast isprovided on outside a curve if track is laid with short welded rails
• An extra width of 7.5 cm ballast isprovided on outside a curve sharper than 3° on B.G. and M.G. tracks
• An extra width of 15 cm ballast is provided on each shoulder if the track is laid with welded rails
• All the above.