What is the purpose of promt engineering?

a$.$Prompt engineering is aimed at creating highly specialized models for singular tasks, limiting their flexibility

b$.$The goal of prompt engineering is to develop a universal model capable of performing a wide array of tasks without customization

c$.$Prompt engineering focuses primarily on the analytical aspect of large language models $($LLMs$),$ without influencing their performance

d$.$Prompt engineering involves designing and refining inputs $($prompts$)$ to effectively guide a large language model in performing specific tasks or generating desired responses