You run the crash utility on an Oracle Linux system after a kernel panic and use the bt -acommand as shown:
crash> bt a
crash> bt -a
PID: 286 TASK: c0b3a000 CPU: 0 COMMAND: "in.rlogind"
# 0 [c0b3be90] crash_save_current_state at c011aed0
# 1 [c0b3bea4] panic at c011367c
# 2 [c0b3bee8] tulip_interrupt at c01bc820
# 3 [c0b3bf08] handle_IRQ_event at c010a551
# 4 [c0b3bf2c] do_8259A_IRQ at c010a319
# 5 [c0b3bf3c] do_IRQ at c010a653
# 6 [c0b3bfbc] ret_from_intr at c0109634

# 7 [c0b3bfbc] sys_select at c012f803
# 8 [c0b3bfc0] system_call at c0109598

Which two statements are true about the purpose of the bt a command?