How many such letters are there in the following string each of which is preceded by a symbol and followed by a number? T 8 & W 8 # Q 6 R & P T & 6 Q 9 D8@7H 9 %

Choose the option that will replace the question mark (?) in the given series to logically complete the series. XV4 SQ9 NL16 ?

What should replace the question mark (?) in the given series to complete it logically? 4-B-D, 8-C-E, 16-D-F, ?, 64-F-H