The following dialog is for questions 7 to 9

Mr. Marko: Hi, Mrs. Rania. Could I ask you a favor, please?

Mrs. Rania: Yes, sure. How could I help you?

Mr. Marko: Next week is our school anniversary. I am now preparing decorations with Mrs. Natalia. Mr. Tiko is now contacting other teachers who can perform acoustic on the stage, However; I am wondering if you could handle the consumption for our internal participants.

Mrs. Rania: I see. Please specify what my tasks are.

Mr. Marko: you will be counting the number of participants after all of them confirm their attendance. You will also be informing our catering services to provide food and beverages with the same number as the participants.

Mr. Rania: O.K. That is crystal clear.

What does the phrase "crystal clear" mean?