How can the code in the following example best be described?

$$

int scoreThreshold$[4]=\{90,80,70,60\}$;

char letterGrade$[4]=\{\text{'}$A$\text{'},\text{'}$B$\text{'},\text{'}$C$\text{'},\text{'}$D$\text{'}\}$;

$$

Question $8$ options:

a$)$

$$multi$-$value arrays

b$)$

$$two$-$dimensional array

c$)$

$$scalar arrays

d$)$

$$parallel arrays