Answer:
It reached long-term memory
Step-by-step explanation:
Long-term memory: In psychology, the term "long-term memory" is considered as one of the different stages in the memory processing model and is the last stage in which memory gets transferred related to any event or situation. It can also be written as LTM, and denoted as "Atkinson–Shiffrin memory model".
In long-term memory, plenty of informative knowledge is being held or kept indefinitely. However, when an individual doesn't utilize a specific memory then it gets transferred into his or her long-term memory if only it got rehearsal and therefore it feels difficult for the person to retrieve it as it is unconsciously present over there.