Question $1$: Object Arrangement $-13\%$

The above are objects on a table. Note that some are indistinguishable $($i$.$e$.,$ identical$).$ In how many ways can these objects be arranged in one line if:

a$)$ They can be arranged in any order, except: a ghost must always be in the leftmost position of the shelf and a box must always be in the rightmost position of the shelf?

b$)$ All boxes must be next to each other?

c$)$ All circles must be placed on the left most positions of the shelf and pacman must be placed on the right most position of the shelf?

d$)$ One ghost must be to the left of pacman?