Write the next sentence in this paragraph:

How to spot an atm skimmer
Examine the card reader for signs of tampering.
Card readers should be sturdily attached to the machine. Anything unusual or out of place may be a sign that it has been tampered with.

Select from the following.
[a]. Be certain you report it to the corporate monitoring agency. You might see a decline in the card reader readings if you've overcharged it..
[b]. Place a drop lock on it to identify it. Most machines have a drop lock that can identify it..
[c]. In particular, be wary if : There are glue marks around the reader. There is tape sticking out from under the reader..
[d]. On modern machines, some devices come with a reader, but check the batteries if the card reader does not fit. You can use a second card reader if none appears to be working..
[c].