DIABOLIC:

A． Traditional irrigation methods tend to come at a lower expense than more modern ones, which are generally dependent on technology.
B． Traditional methods may best be used in areas where the technological knowledge necessary for using modern techniques is limited.
C． Modern methods, unlike traditional ones, can only help land whose primary water source comes from irrigation, not rainfall.
D． Modern methods rely more heavily upon groundwater tapping, which itself depletes the aquifer.
E． Traditional methods can be performed without the tedious and difficult calculation of climate factors.

A． The technology is more expensive to develop than the technology that was required in electronic computing.
B． The search for technology necessary for all-optical computing is considered unfeasible and has been largely abandoned.
C． Optical computers systems that rely on digital partitioning algorithms in tandem with error-correction codes are considered hybrid technology.
D． The technology necessary for digital optical computing appears within closer reach than the technology for analog optical computing.
E． The most feasible version of optical computing at present is a synthesis of electronic and optical technology.