Consider the following multi-threaded pseudocode. Thread A: 1. lock (& mutex); 2. if( queue empty ()) { 3. cond_wait (&cv, & mutex); 4.] 5. data = queue.pop(): 6. unlock (& mutex); Thread B: 1. lock (& mutex); 2. queue insert (data); 3. cond signal (& cv); 4. unlock (& mutex); A. Thread A Line 2 B. Thread A Line 3 C. Thread B Line 2 D. Thread B Line 3 E. No bugs

Question: In the context of databases, what does the acronym SQL stand for? a) Structured Question Language b) Simple Query Language c) Standard Query Language d) Sequential Query Language

Is PET or PET_2 a better design? Explain your rationale.

Write a SQL statement to prepare a list with salesman name, customer name and their cities for the salesmen and customer who belongs to the same city.