p-dropdown(primeng) optionDisabled property is not working such unbale to disable the dropdown...

<p-dropdown [options]="cities"
[(ngModel)]="selectedCity"
optionLabel="label"
optionDisabled="IsActive"></p-dropdown>


this.cities = [
{ label: 'India', value: 'IND', IsActive: false },
{ label: 'Rome', value: 'RM', IsActive: true },
{ label: 'London', value: 'LDN', IsActive: false },
{ label: 'Istanbul', value: 'IST', IsActive: true },
{ label: 'Paris', value: 'PRS', IsActive: false },
];


I want IsActive false options to be seen grayout but optionDisabled is not setting it. Is there any property or code I missed ??

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