Check the alternative that contains ALL possible real values of m so that the following lines r and s are concurrent: r: ⎧⎩⎨x=mt−6 y=t+3 z=t−8 t∈R s: x−m/2=1−y=z+4 options: a. m can be any real...

Check the alternative that contains ALL possible real values of m so that the following lines r and s are concurrent:

r: ⎧⎩⎨x=mt−6

y=t+3

z=t−8

t∈R

s: x−m/2=1−y=z+4

options:

a. m can be any real number.
b. m = 71
c. There is no real number m that satisfies the condition.
d. m = 2
e. m ≠ 1 and m ≠ 18