Which type of UPS (Uninterruptible Power Supply) can undergo maintenance while remaining online?
A.
hot-swap battery enabled UPS (Uninterruptible Power Supply)
B.
smart slot enabled UPS (Uninterruptible Power Supply)
C.
hot-spare battery enabled UPS (Uninterruptible Power Supply)
D.
extended runtime enabled UPS (Uninterruptible Power Supply)
E.
smart cable enabled UPS (Uninterruptible Power Supply)