When migrating the ARM template expression [if(parameters('isComplete'), '1a', '2a')] to Bicep, which of the following expressions is equivalent?

The correct answer is isComplete ? '1a' : '2a'. Bicep uses the ternary operator ? : for conditional expressions, which is a common syntax in many programming languages. This directly translates the ARM if function, where the first operand is the condition, the second is the result if true, and the third is the result if false. The option iif(isComplete, '1a', '2a') is incorrect because iif is not a valid Bicep function; it's sometimes seen in other scripting contexts. The option if(isComplete, '1a', '2a') is incorrect because Bicep does not have an if function for conditional expressions in this manner; if is used for conditional deployment of resources. The option if('isComplete') '1a' else '2a' is incorrect as it uses an if/else statement syntax, which is not how conditional expressions are formed in Bicep.