Creep of concrete under compression is defined as the _________. 

A singly reinforced concrete beam of balanced section is made of M20 grade concrete and Fe415 grade steel bars. The magnitudes of the maximum compressive strain in concrete and the tensile strain in the bars at ultimate state under flexure, as per IS 456 ∶ 2000 are ________, respectively. (round off to four decimal places)

Consider a doubly reinforced RCC beam with the option of using either Fe250 plain bars or Fe500 deformed bars in the compression zone. The modulus of elasticity of steel is 2 × 10⁵ N/mm² . As per IS456 : 2000, in which type(s) of the bars, the stress in the compression steel (f_sc) can reach the design strength (0.87 f_y) at the limit state of collapse?