Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to effectively use email at work [title] Allocate specific times of the day to read and respond to your e-mail. [step] If you don't stay in control of checking your e-mail, you may end up wasting too much of your work day checking it. Try to respond to emails immediately.

Ending1: While you can use your email system to get more emails, remember to adjust your work email usage to accommodate any change in time. [substeps] Use social media to check your e-mail and read your e-mail. Ending2: [title] Organize your email whenever you are in it. [step] Effective use of work email includes deleting emails you know you won't need as you read them and filing those that you will need in specified folders. Ending3: Staying in control of your personal email should be your top defense when handling an in-office correspondence. [title] Identify your e-mail's subject line. Ending4: Or try to set an automatic schedule to read them at other times. [substeps] Plan to read at least once a day, unless you work on a busy schedule.

Answer format: ending1/ending2/ending3/ending4