(18)Point (d) of Article 59(3) of Regulation (EU) No 909/2014 requires that a CSD-banking service provider accepts highly liquid collateral with minimal credit and market risk to manage its corresponding credit risk. The same allows for other types of collateral than highly liquid collateral with minimal credit and market risk to be used in specific situations, with the application of an appropriate haircut. To facilitate this, a clear hierarchy of the collateral quality should be set in order to distinguish which collateral should be acceptable to fully cover credit risk exposures, which collateral is acceptable as liquidity resource and which collateral, although remaining acceptable for mitigating credit risk, requires qualifying liquidity sources. Collateral providers should not be impeded from freely substituting collateral depending on their availability of resources or their asset-liability management strategies. Thus, common collateral practices, such as the reliance on participants' pledge accounts, where the collateral is deposited by the participant in its pledged accounts in order to fully cover any credit exposure should be allowed to be used for substituting collateral as long as the quality and liquidity of the collateral is monitored and complies with the requirements of this Regulation. Under such pledge account arrangements, the collateral is deposited by the participant in his pledged accounts in order to fully cover any credit exposure. In addition, a CSD-banking service provider should accept collateral taking into account the hierarchy specified, but may perform the liquidation of the accepted collateral, where necessary, in the most efficient way following a participant's default. However, from a prudential viewpoint, a CSD-banking service provider should be able to monitor the availability of collateral, its quality and its liquidity on an ongoing basis to fully cover credit exposures. It should also have arrangements in place with the borrowing participants to ensure that all the collateral requirements of this Regulation are met at all times.