Define the method peekFrontfor the sorted list implementation of the ADTpriority queue.
What will be an ideal response?
```
template
ItemType SL_PriorityQueue
throw(PrecondViolatedExcept)
{
if (isEmpty())
throw PrecondViolatedExcept("peekFront() called with empty queue");
else
// Priority queue is not empty; return highest-priority item;
// it is at the end of the sorted list
return slistPtr->getEntry(slistPtr->getLength());
} // end peek
```
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