angular - 如何禁用prime ng下拉列表中的特定选择项？

Question

我有一个像这样的angular应用程序primeNg dropdown

 <p-dropdown class="ml-4 mt-2" styleClass="p-zero" optionLabel="name" dataKey="name" placeholder="Select Matrix"
  [options]="partPricings" (onChange)="handleDropdownSelect($event)" [(ngModel)]="selectedPart">
</p-dropdown>

`component.ts'

this.partPricings = [
  {
     type: "part"
     default: false
     isInActive: false
     _id: "5e80a39db0f2323bb861006f"
     name: "Default Pricing"
     items: [{min: 0, max: 310, markup: 23}]
  },
        {
     type: "part"
     default: false
     isInActive: false
     _id: "5e80a39db0f2323bb861006g"
     name: "Test Matrix"
     items: []
  }
]

现在我想disable在dropdown. 那么我该怎么做呢？