Identify what problem$($s$)$ could occur with the following code. Multiple answers are possible.

function start$()\{$

const canvas $=$ document.querySelector$("$canvas$")$;

const ctx $=$ canvas.getContext$("2$d$")$;

$\}$

start$()$;

Group of answer choices

The HTML code does not include a canvas element.

Naming a JavaScript variable with an HTML element name is not supported and will cause a runtime error.

The querySelector$()$ function could return null.

The start$()$ function must have an event parameter or a runtime error will occur.