Consider the following linear programming problem:

Minimize $Z=170A+160B+175C+180D+195E,$

Subject $to$:

$A48$

$A+B79$

$A+B83$

$A+B+C87$

$B+C64$

$C+D83$

$C+D82$

$D43$

$D+E52$

$E15$

and

$A0,B0,C0,D0,E0$

This $is$ a linear programming problem $in$ which there are how many redundant constraints $in$ the $LP$ formulation?

$3$

$5$

$2$

$1$