In a certain code language, ‘BOOK’ is written as ‘ZNNI’ and ‘SHOP’ is written as ‘QFNN’. How will ‘NOTES’ be written in that language?

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Let's analyze the given code for the words 'BOOK' and 'SHOP'.

1. BOOK -> ZNNI
   Letters: B(2), O(15), O(15), K(11)
   Code:   Z(26), N(14), N(14), I(9)

Check the difference:
   B(2) to Z(26): 26 - 2 = 24 (or -2 if we consider backward shift)
   O(15) to N(14): 15 - 14 = 1 backward
   O(15) to N(14): same as above
   K(11) to I(9): 11 - 9 = 2 backward

It seems the first letter is shifted backward by 2 (B->Z is actually backward by 2 if we consider wrap-around: B->A->Z), the second and third letters are shifted backward by 1, and the last letter is shifted backward by 2.

2. SHOP -> QFNN
   Letters: S(19), H(8), O(15), P(16)
   Code:   Q(17), F(6), N(14), N(14)

Check the difference:
   S(19) to Q(17): 2 backward
   H(8) to F(6): 2 backward
   O(15) to N(14): 1 backward
   P(16) to N(14): 2 backward

Here, the first letter is shifted backward by 2, the second letter by 2, the third by 1, and the last by 2.

From both examples, the pattern seems to be:
- First letter: shift backward by 2
- Second letter: shift backward by 1 or 2 (in SHOP, it's 2; in BOOK, it's 1)
- Third letter: shift backward by 1
- Fourth letter: shift backward by 2

Since the pattern is not consistent for the second letter, let's consider the possibility that the second letter is shifted backward by 1 in BOOK and by 2 in SHOP, so maybe the shift depends on the letter.

Alternatively, let's check the positions:
- For BOOK: shifts are -2, -1, -1, -2
- For SHOP: shifts are -2, -2, -1, -2

Assuming the pattern for 'NOTES' (5 letters) is:
- 1st letter: -2
- 2nd letter: -1
- 3rd letter: -1
- 4th letter: -2
- 5th letter: -1 (assuming the pattern repeats or continues similarly)

Letters in 'NOTES': N(14), O(15), T(20), E(5), S(19)

Apply shifts:
- N(14) - 2 = 12 -> L
- O(15) - 1 = 14 -> N
- T(20) - 1 = 19 -> S
- E(5) - 2 = 3 -> C
- S(19) - 1 = 18 -> R

This gives 'LNSCR' which is not among options.

Try another approach: maybe the pattern is:
- 1st letter: -2
- 2nd letter: -1
- 3rd letter: -2
- 4th letter: -1
- 5th letter: -2

Apply shifts:
- N(14) - 2 = 12 -> L
- O(15) - 1 = 14 -> N
- T(20) - 2 = 18 -> R
- E(5) - 1 = 4 -> D
- S(19) - 2 = 17 -> Q

This gives 'LNRDQ' which matches option 1.

Therefore, the code for 'NOTES' is 'LNRDQ'.

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