Why does a SQL injection code usually contains $$ or $1=1--?$

Question $3$ options:

bypass a web app$$s authentication

to make the WHERE clause in the SQL statement always true

modify sensitive data

modify or create new user permissions

Question $4(2$ points$)$

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Why does a SQL injection code typically ending with $--,$ or # $?$

Question $4$ options:

modify or create new user permissions

gain access to unauthorized info

to comment out the rest of the SQL statement

bypass a web app$$s authentication

Question $5(2$ points$)$

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Which of the following statements is TRUE about the value $1\text{'}$ or $\text{'}0\text{'}=\text{'}0$ provided in the "User ID$"$ field at Step $7$ on page $15$ of Ethical Hacking Lab $14?$

Question $5$ options:

it contains a syntax error

never makes the WHERE clause in a SQL statement true

it contains multiple syntax errors

always makes the WHERE clause in a SQL statement true