Which type of memory is best suited for digital electronics applications where high storage capacity is required at a low cost?

Correct option is D

​$$\text{For digital electronics applications that require high storage capacity at low cost, DRAM is the most suitable choice:} \\[8pt]\bullet \ \text{High density: Stores more bits per unit area} \\[4pt]\bullet \ \text{Low cost per bit: Much cheaper than SRAM} \\[4pt]\bullet \ \text{Widely used as main memory in computers and digital systems}$$​​