Given the code below, what are some limitations of the way traversal is being done?
marbles = ["red","blue","green","orange","yellow"]
for marble in marbles:
#loop body
a.
The traversal must always cover all elements from start to end
b.
You can't do any processing that relies on a numeric list index or knowledge of where you are in the list
c.
All of these are limitations
d.
You cannot update any list elements inside the loop body