Pick up the correct statement from the following:

• The effective span of a simply supported beam is clear span plus its effective depth or centre to centre of supports whichever is less
• The effective span of a simply supported slab is clear span plus its effective depth or centre to centre of supports whichever is less
• The effective span of a continuous beam or slab is the clear span plus its effective depth or centre to centre of supports whichever is less, provided the width of the support is less than of clear span
• For spans with roller or rocker bearing, the effective span is the distance between the centres of bearings
• All the above.