$41-$ They are a group of methodologies that utilize incremental changes focusing on quality and attention to detail. Each increment is released in a specified period $($called a time box$),$ creating a regular release schedule with specific objectives. While considered a separate methodology from RAD, the two methodologies share some of the same principles, such as iterative development, user interaction, and flexibility to change. Find the missing word

a$-$Agile Methodologies

b$-$ Direct Methodologies

c$-$ Indirect Methodologies

d$-$Collaborative Methodologies