$1-$ What are the solutions in the website development to stop the SQL injection? Explain them.

Denial$-$of$-$service attack $($DoS attack$)$ is a cyber$-$attack in which the perpetrator seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a host connected to a network. Denial of service is typically accomplished by flooding the targeted machine or resource with superfluous requests in an attempt to overload $-$ systems and prevent some or all legitimate requests from being fulfilled.