It is considered normal to accept a job offer and back out of another job offer. Hence option A is correct.
If the offer from your current employers states that you should not work for a firm with similar services, then it is unethical to accept offers from such firms.
In summary, before leaving a current job for a new one, a notice should be given.
Learn more about job ethics here:
https://brainly.com/question/12156293
#SPJ4