Answer:
Option No. 4: Grades is the correct answer
Step-by-step explanation:
When a company hires any personnel for a job or service they are concerned about their skills and professional attitude. Grades are usually a source to determine how well a person performs in a skill or how much knowledge does a person has about a specific field.
Out of all the given options, an employer will certainly be interested in a person's grades to determine how well he performs in a service.
Hence,
Option No. 4: Grades is the correct answer