An assembly line is designed like this.

WS #$1-$ ABC$-50$ sec

WS #$2-$D $,-45sec$

WS #$3-$ FG $-80$ sec

WS #$4-$H $,-60sec$

WS #$5-$JKLM$-55$ sec

Which workstation is the bottleneck? No calculations are required for this question.

WS $24$

WS $75$

WS $81$

ws $49$

WS ${?}_2$