You are programming a buffer overflow exploit and you want to create a NOP sled of 200 bytes in the program exploit.c What is the hexadecimal value of NOP instruction?

`0x60` is the opcode for PUSHAD (Push All General-Purpose Registers) in x86, not NOP.

`0x80` is a common prefix for many two-byte instructions (e.g., immediate byte following), not the NOP instruction itself.

`0x70` is the opcode for JNO (Jump if No Overflow), a conditional jump instruction, not NOP.

In the x86 instruction set, `0x90` is the single-byte opcode for the NOP (No-Operation) instruction. A NOP sled consists of a sequence of these instructions, providing a range of memory addresses where execution can land and slide down to the actual shellcode, making buffer overflow exploitation more reliable.