Which of the following could potentially break the chain of custody for a particular piece of evidence?

a. Failing to safely package a device prior to shipping, resulting in damage.
b. Failing to get a date and signature when you transfer the evidence over to the storage facility.
c. Inverting two evidence ID numbers on a chain of custody log that logs multiple devices.
d. Inadvertently dropping the device while transporting it to your vehicle, rendering the device inoperable.

b. c.