• Target Material in X-Ray Tubes: In diagnostic X-ray tubes, Tungsten (Wolfram, $W$, atomic number $Z = 74$) is the metal of choice for the anode target and cathode filament because of its exceptionally high melting point of $3370^\circ\text{C}$ (or $3422^\circ\text{C}$).
• Thermal Dissipation: Because over $99\%$ of electron kinetic energy colliding with the target is converted into heat and less than $1\%$ into X-rays, the high melting point prevents anode pitting, vaporization, and tube failure.

Correct option: (2) 3370°C