A rectangular footing $2$m by $3\mathrm{.}5$m is to be reinforced along the short direction by dividing into $3$ sections; the center strip and two outer strips. It has strengths of f$$c$=20$ MPa and fy$=276$ MPa and an effective depth of $545$ mm with $100$ mm steel cover. $($code $=$ NSCP$-2015)$

a$.$ How many $25$ mm $$ bars should be placed at the center strip based on the minimum steel requirement of the code?

b$.$ How many $25$ mm $$ bars should be placed at the outer strips based on the minimum steel requirement of the code?

c$.$ What are the maximum values of the spacing of the main and temperature bars?