A Linux administrator looks at the /etc/timezone file and determines the need to change the time zone from California to New York temporarily. Which of the following commands will accomplish this?

`sed -f TZ=America/New_York` is syntactically incorrect for setting an environment variable; `sed` is a stream editor used for text transformation based on scripts or expressions.

`cat TZ=America/New_York` would attempt to display the contents of a file named 'TZ=America/New_York', which is not how environment variables are set or modified.

The `TZ` environment variable controls the timezone setting for the current shell session and any processes launched from it. Using `export TZ=America/New_York` temporarily overrides the system's default timezone, ensuring that time-related commands reflect the New York timezone only in that session.

`printf TZ=America/New_York` would simply print the literal string 'TZ=America/New_York' to standard output, without setting any environment variable.