Explanation:

A programming language is a formal language that defines a set of symbols, keywords, and a set of rules (syntax) to construct statements. These elements allow programmers to write instructions that a computer can understand and execute. Option (b) Programming language correctly encompasses all these components. Option (a) Computer program refers to the output or result written in a programming language, not the language itself. Option (c) Assemble is a process of converting assembly language to machine code. Option (d) Syntax refers specifically to the rules for structuring statements, which is a part of a programming language, but not the entire set of symbols, keywords, and rules as described.