Situation $4$

From the beam shown below, assume EI $=$ constant.

$12.$ Which of the following gives the moment at $B$ in $N-m.$

a$.+2800$

c$.-3600$

b$.+3600$

d$.-2800$

Which of the following gives the moment at $C$ in $N-m.$

a$.-1400$

c$.+1400$

b$.+3800$

d$.-3800$

Which of the following gives the reaction $R$ in Newton.

a$.4000$

c$.3800$

b$.4200$

d$.3600$