The message has to be short, brief or crisp?

To understand the correct answer, let's first define the terms "short," "brief," and "crisp" in the context of a message.

Short:
A short message refers to one that is concise and to the point. It avoids unnecessary details and focuses on conveying the main idea or information in a succinct manner.

Brief:
A brief message is similar to a short one, but it also implies that the message contains only the essential information required. It eliminates any extraneous or non-essential details, making the message as concise as possible.

Crisp:
A crisp message goes a step further than a short or brief one. It not only needs to be concise and to the point but also needs to be compelling and impactful. A crisp message captures the recipient's attention and leaves a lasting impression.

Now, let's analyze the provided options:

a) Only Short: This option implies that the message only needs to be concise and to the point, without any additional requirements for impact or brevity.

b) Short and Crisp: This option encompasses both the qualities of being concise and impactful. It suggests that the message should not only be short but also needs to capture the recipient's attention and make an impression.

c) Short and Brief: This option combines the qualities of conciseness and essentiality. It implies that the message should be short and contain only the necessary information.

d) Short, Brief, and Crisp: This option includes all the desirable qualities of a message – it needs to be concise, essential, and impactful. A message that is short, brief, and crisp would capture the recipient's attention, convey the necessary information, and have a lasting impact.

Conclusion:
The correct answer is option 'd' - Short, Brief, and Crisp. This option ensures that the message is not only concise but also contains only the essential information while making a compelling impact on the recipient.