Consider the following statements in the light of IS: 456 - 2000: 
1) There is an upper limit on the nominal shear stress in beams (even with shear reinforcement) due to the possibility of crushing of concrete in diagonal compression. 
2) A rectangular concrete slab whose length is equal to its width may not be a two-way slab for certain definable support conditions. 
Which of the above statements is/are correct?