"That she is a reliable colleagueis appreciated by the entire office." What type of clause is the underlined one?

• That she is a reliable colleague is appreciated by the entire office.". Here the underlined clause is a - Noun clause.

• Noun Clause: 
- A noun clause is a group of words that band together and act like a noun.
- Nouns clauses are used when a single word isn't enough.
- They're always dependent clauses.

একটি বাক্যের চারটি স্থানে Noun clause  বসতে পারে-
1. Subject হিসাবে 
2. Transitive verb এর object হিসেবে
3. Linking verb এরপরে complement হিসাবে 
4. Preposition এর Object হিসেবে।
প্রদত্ত বাক্যে 'That she is a reliable colleague' clause টি Subject হিসাবে বসাতে এটি Noun clause.