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 is a stream editor used for text substitution in files or streams; it cannot set environment variables.

cat is used to display or concatenate file contents and cannot define or export environment variables.

The export command sets an environment variable and makes it available to child processes for the duration of the current session. Setting TZ=America/New_York overrides the system timezone temporarily without modifying /etc/timezone or /etc/localtime, which is exactly the behavior required.

printf formats and prints text output to stdout; it has no ability to set or persist environment variables in the current shell.