What are the two types of memory according to how information is stored and remembered?

I - Explicit and implicit memory are two types of memory according to how information is stored and remembered.
II - Explicit memory is intentional and includes learning about people, places, and events that we can verbally relate to, while implicit memory is incidental and allows us to learn things without realizing it and without great effort.
III - Explicit memory is incidental and allows us to learn things without realizing it and without great effort, while implicit memory is intentional and includes learning about people, places, and events that we can verbally relate to.
IV - Explicit and implicit memory are two types of memory according to how information is processed.
a) I and II are correct.
b) II and IV are correct.
c) I and IV are correct.
d) II and III are correct.