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

You run the crash utility on an Oracle Linux system after a kernel panic and use the bt – a command as shown: 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] tulipjnterrupt at c01bc820
#3 [c0b3bf08] handle_IRG_event at c010a551
#4 [c0b3bf2c] do_8259A_IRO at c010a319
#5 [c0b3bf3c] doJRQ at c010a653
#6 [c0b3bfbc] ret_from_intr at c0109634
EAX:
00000000
EBX:
c0e68280
ECX:
00000000
EDX:
00000004
EBP:
c0b3bfbc
DS:
0018
ESI:
00000004
ES:
0018
EDI:
c0e68284

CS:
0010
EIP:
c012f803
ERR:
Ffffff09 E FLAGS:
00000246

#7 [c0b3bfbc] sys_select at c012f803 #8 [c0b3bfc0] system_call at c0109598 EAX:
0000008e
EBX:
00000004
ECX:
bfffc9a0
EDX:
00000000
DS:
002b
ESI:
bfffc8a0
ES:
002b
EDI:
00000000
SS:
002b
ESP:
bfffc82c
EBR:
bfffd224
CS
0023
EIP:
400d032e
ERR:
0000008e
EFLAGS:
00000246

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

A.
it shows stack traces of all tasks and threads.

B.
it shows stack traces of the active task on each CPU.

C.
The output of each CPU must be requested separately.

D.
it may help show a relationship between panicking tasks on one CPU and tasks on other CPUs.