The following is an incorrect flowchart proving that point l, lying on line lm which is a perpendicular bisector of segment jk, is equidistant from points j and k:

what is the error in this flowchart?

a. jl and kl are equal in length, according to the definition of a midpoint.
b. jl and kl are equal in length, according to the definition of a midpoint.
c. an arrow is missing between the given statement and ∠lnk ≅ ∠lnj.
d. triangles jnl and knl are congruent by side-angle-side (sas) postulate instead of angle-angle-side (aas) postulate.