Every record in a file should contain at least one key field.

If there are multiple threads at the highest priority level in the Java virtual machine, those threads execute using a(n) ________ scheduling algorithm.

a) FIFO b) round-robin c) SPF d) SRT

A vertex u of a directed graph can end up in a depth-first tree containing only u, even though u has both outward and inward edges.

b. False