Question Content Area

Let Pij $=$ the production of product i in period j$.$ To specify that production of product $1$ in period $3$ and in period $4$ differs by no more than $100$ units,

P$13$ P$14<=100$; P$13$ P$14>=100$

P$13$ P$14<=100$; P$14$ P$13>=100$

P$13$ P$14<=100$; P$14$ P$13<=100$

P$13$ P$14>=100$; P$14$ P$13>=100$