Refer to the following number and symbol series and answer the question that follows. Counting to be done from left to right only.
(Left) & + + % 5 / 6 % 2 / 1 9 * $ @ 4 / / & 7 < (Right)
How many such symbols are there each of which is immediately preceded by another symbol and also immediately followed by a number?
AOne
BThree
CFour
DTwo