-

checkFileName(filename), which returns a Promise. The promise

fulfills to true if the filename uses only valid characters, else it fulfills to false.

-

checkIfExists(filename), which returns a Promise. The promise

fulfills to true if filename exists on the filesystem, else it fulfills false.

Consider

the following versions of the async function processFileName. Which

version(s) correctly checks if a filename uses only valid characters and

then if the file exists? (async functions can use the await keyword in their body)