Which of the Following Statement(s) Is True for Sparse-Memory Graph

Multiple Choice

Which of the following statement(s) is true for Sparse-Memory Graph Search (SMGS) ?

A) the boundary is defined as those nodes in closed that have at least one successor still in open
B) the nodes in closed that are not on the boundary are in the kernel
C) the number of relay nodes on each path is exactly one.
D) both a & b