Is a boolean variable that signals when some condition exists in the program?

A __________ is a Boolean variable that signals when some condition exists in the
program.
a. flag
b. signal c. sentinel
d. siren

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Is a boolean variable that signals when some condition exists in the program?

Is a boolean variable that signals when some condition exists in the program?

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    Praticing  Write a flowgorithm program that will calculate a person’s mobile phone bill based on plan chosen and the data used.  The program should perform the following: Ask for customer’s mobile plan Ask for the number of gigabytes of data used Display an error message if the plan choice is invalid or the gigabytes used is less than zero (0) Mobile data plans are: Plan A 19.99/month, with 4 gigabytes data, additional data $10/gigabyte Plan B 29.99/month, with 8 gigabytes data, additional data $5/gigabyte Plan C 39.99/month, unlimited data   Remember the following: use clear prompts for your input label each output number or name (Comment: I need help practicing with Flowgorithm, I don't understand the concept of flowgorithm, and I need the practice to help me understand computer science better. Please help me, thank you).

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    Is a Boolean variable that signals when some conditions exist in the program?

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