Respuesta :

I believe the answer is: open and unsecured 

Open credit refers to a type of credit that provided money to be borrowed at a certain time when we need it. 
And unsecured credit refers to a type of credit that does not protected by asset collateral.
Credit cards have both of these characteristics.

The credit cards are D. Open and unsecured.

The credit cards have been always described as being open and unsecured.

Credit Cards Characteristics

Credit cards are post pay and the card provider usually charges a nominal amount of interest on the amount of credit used, this interest is payable on an agreed date along with the amount of the credit utilised.

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