This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to block a credit card
Call your creditor or log on to your online account.
Many credit issuers allow customers to temporarily block a missing card. If your creditor offers this feature, visit their website or open your mobile app.

OPT:
(a). The ftc website is an excellent resource for locating blocked cards. Go here: https: // www.ftc.gov /? = ler.;
(b). You can also call your creditor and have a customer service representative make the switch. If you have an online account, you'll only need to log into the website.;
(c). This method works with any credit card, but also many other accounts. Call the creditor's website or visit an app like https: // www.creditment.gov.;
(d). Go to https: // www.flonins.gov/world-credit-card-service. You may have to scroll down to find this option.;
The answer is:
(b).