Child-Pays-for-Parent (CPFP) strategy. This involves creating a new transaction that spends an output of the original transaction, with a high enough fee to incentivize miners to confirm both transactions together.
No fee bumping strategy. This indicates that fee bumping is not necessary or possible for the transaction.
Replace-By-Fee (RBF) strategy. This involves creating a new transaction that replaces the original one with a higher fee.
Enum representing different fee bumping strategies. These strategies are used to increase the fee of a transaction to improve its chances of confirmation.